An acronym is a word formed from the initial letter of a group of connected words e.g. BRAG, TOSRV, and is pronounced as a word, while initialism is an abbreviation containing initial letters that are pronounced separately e.g. ATM, RAC.
The following list of 1,818 (updated Jan 22, 2023) commonly used acronyms and abbreviations can assist trails and greenway managers and advocates decipher the “alphabet soup” of trail development.
| 100MW | 100 Mile Wilderness (Stretch of Appalachian Trail in ME) |
| 21CSC | 21st Century Conservation Service Corps |
| ASS | Above Seat Steering (recumbent) |
| ATM | Access & Travel Management |
| ADP | Access Designation Process |
| APS | Accessible Pedestrian Signal |
| ATMO | According To My Opinion |
| XOBA | Across Ohio Bicycle Adventure |
| AAA | Action Against Automobiles |
| ACT | Action Changes Everything |
| ACE | Active Community Environment |
| ALTN | Active Living & Transportation Network |
| ATP | Active Transportation Program (CA) |
| ATIIP | Active Transportation Infrastructure Investment Program (2021) |
| ADL(s) | Activities of Daily Living |
| ALIVE | Activity, Learning, Intimacy, Vitality, and Engagement |
| AMS | Acute Mountain Sickness |
| AQ | Actual Quantities |
| AEM | Adaptive Ecosystem Management |
| ADK | Adirondack Mountain Club (NY) |
| Admin | Administrative |
| AR | Administrative Record |
| AAT | Adopt-a-Trail |
| ABC | Advance Base Camp |
| APT | Advanced Performance Technology |
| ACA | Adventure Cycling Association |
| ACHP | Advisory Council on Historic Preservation |
| ACES | Advocacy, Courtesy, Environmentalism, Stewardship |
| ABC | Aggregate Base Course |
| AUV | Agricultural Utility Vehicle |
| ADY | Ain’t Dead Yet |
| ABC Quick Check | Air, Brakes, Cranks, Chain, Cassette, Quick Release, Check it Over |
| ATWA | Air, Trees, Water, and Animals |
| ABCDE | Airway, Breathing, Circulation, Disability, Exposure |
| AAC | Alaska Alpine Club |
| AHET | Albany-Hudson Electric Trail (NY) |
| ASC | Albuquerque Service Center (US Forest Service) |
| AVPU | Alert, Verbal, Painful, Unresponsive |
| ABOB | All Bodies on Bikes |
| APT | All Purpose Trail |
| ATB | All Terrain Bicycle |
| ATV | All Terrain Vehicle |
| AVACS | All Valves Adjustable Connecting Systems (on bicycle pump) |
| AYCE | All You Can Eat (All You Care to Eat) |
| ATA | Allegheny Trail Alliance (PA) |
| AVTA | Allegheny Valley Trails Association (PA) |
| AHC | Allentown Hiking Club (PA) |
| ACC | Alpine Club of Canada |
| AKA | Also Known As |
| ATV | Alter-the-Terrain Vehicle |
| ASB | Alternative Spring Break |
| ATPPL | Alternative Transportation in Parks and Public Lands (Funding) |
| ABLA | Amateur Bicycle League of America |
| AIT | Amelia Island Trail (FL) |
| AGO | America’s Great Outdoors (initiative) |
| AAPRA | American Academy for Park & Recreation Administration |
| AAC | American Alpine Club |
| AARP | American Association of Retired Persons |
| ASSHTO | American Association of State Highway and Transportation Officials |
| ABA | American Bicycle Association |
| ACA | American Canoe Association |
| ACSM | American College of Sports Medicine |
| ACTHA | American Competitive Trail Horse Association |
| ACE | American Conservation Experience |
| ACSA | American Council of Snowmobile Associations |
| ADT | American Discovery Trail |
| AERC | American Endurance Riders Conference |
| AFB | American Farm Bureau |
| AHRI | American Heritage Rivers Initiative |
| AHS | American Hiking Society |
| AHC | American Horse Council |
| AIA | American Institute of Architects |
| AMA | American Motorcyclist Association |
| AMBA | American Mountain Bike Association |
| ANSI | American National Standards Institute |
| AQHA | American Quarter Horse Association |
| ARRA | American Recovery and Reinvestment Act of 2009 |
| ARC | American Recreation Coalition |
| ARC | American Red Cross |
| ASTM | American Society for Testing and Materials |
| ASLA | American Society of Landscape Architects |
| ATT | American Tobacco Trail (NC) |
| ATHA | American Trail Horse Association |
| ATRA | American Trail Running Association |
| AT | American Trails |
| AYH | American Youth Hostels (now HI-USA) |
| ARRA | Americans for Responsible Recreation Access |
| ADA | Americans with Disabilities Act |
| ADA/ABAAG | Americans with Disabilities Act/Architectural Barriers Act Accessibility Guidelines |
| ADAAG | Americans with Disabilities Act Accessibility Guidelines |
| ART | Anacostia Riverwalk Trail (DC) |
| ADZ | Annual Day Zero (Pacific Crest Trail Kick Off Party) |
| ADZPCTKO | Annual Day Zero Pacific Crest Trail Kick Off |
| AFBRAAM | Annual Fit-Fest Bike Ride Across America |
| AWP | Annual Work Plan |
| ACC | Appalachian Conservation Corps |
| ALDHA | Appalachian Long Distance Hikers Association |
| AMC | Appalachian Money Club |
| AMBC | Appalachian Mountain Bike Club (TN) |
| AMC | Appalachian Mountain Club |
| ANST | Appalachian National Scenic Trail |
| ANSTAC | Appalachian National Scenic Trail Advisory Council |
| AT | Appalachian Trail |
| A.T.CAMP | Appalachian Trail Camping Availability Management Program |
| ATC | Appalachian Trail Conservancy (formally Conference) |
| ATJ | Appalachian Trail Journeys (ATC membership magazine) |
| ATLAFO | Appalachian Trail Land Acquisition Field Office (Harpers Ferry, WV) |
| ATLP | Appalachian Trail Landscape Partnership |
| ATPO | Appalachian Trail Park Office (Harpers Ferry, WV) |
| ATPO | Appalachian Trail Project Office (Harpers Ferry, WV) |
| AOP | Aquatic Organism Passage |
| APRA | Archaeological Resource Protection Act (US) |
| ABA | Architectural Barriers Act |
| ABAAS | Architectural Barriers Act Accessibility Standard |
| ACEC | Area of Critical Environmental Concern |
| APE | Area of Potential Effect |
| ABA | Arizona Bicycle Association |
| ABRA | Arizona Bicycle Racing Association |
| ABTF | Arizona Bicycle Task Force |
| AzHC | Arizona Horse Council |
| AOHVA | Arizona Off-Highway Vehicle Association |
| APTS | Arizona Premier Trails System |
| ASPT | Arizona State Parks and Trails |
| AZT | Arizona Trail |
| AZTA | Arizona Trail Association |
| ARHCR | Arkansas High Country Route |
| AM-RAP | As Many Rounds As Possible |
| ASAP | As Soon as Possible |
| AVL | Asheville, NC |
| AoB, AOB | Asheville on Bikes (NC) |
| AD | Assistant Director |
| ANFT | Association of Nature and Forest Therapy |
| AORE | Association of Outdoor Recreation and Education |
| APPL | Association of Partners for Public Lands |
| APBP | Association of Pedestrian and Bicycle Professionals |
| ACT | Atlantic Canada Trails Association |
| ART | Attention Restoration Theory |
| ASI | ATV Safety Institute |
| AED | Automated External Defibrillator(s) |
| AV | Autonomous Vehicle |
| ADT | Average Daily Traffic |
| BATONA | Back To Nature |
| BCA | Backcountry Access |
| BBTC | Backcountry Bicycle Trails Club (WA) |
| BCHA | Backcountry Horsemen of America |
| BCHI | Backcountry Horsemen of Idaho |
| BUS | Backcountry Use System |
| BBC | Baltimore Bicycling Club (MD) |
| BMR | BasalMetabolic Rate |
| BPW | Base Pack Weight |
| BRAMBA | Baton Rouge Area Mountain Bike Association (LA) |
| BIKE | Be Inclusive Kill Exclusivity |
| BPM | Beats Per Minute (heart rate) |
| BTDTGITS | Been There, Done That, Got The T-shirt |
| BC | Before Cars |
| BMP | Beginning Measure Point |
| BOMB | Believers on Mountain Bikes |
| BM | Bench Mark |
| BBM | Benefits-Based Management |
| BMT | Benton Mackaye Trail (GA, NC, TN) |
| BMTA | Benton Mackaye Trail Association (NC) |
| BTU | Berkeley Trailers’ Union (CA) |
| BAMBA | Berks Area Mountain Bike Association (Reading, PA) |
| BMP | Best Management Practices |
| BUILD | Better Utilizing Investments to Leverage Development (Federal grant program) |
| BAMA | Bicycle Across Magnificent Alabama |
| BAMMI | Bicycle Across the Magnificent Miles of Illinois |
| BASC | Bicycle Across South Carolina |
| BAC | Bicycle Adventure Club (San Diego, CA) |
| BAC | Bicycle Advisory Committee |
| BCA | Bicycle Corporation of America (Manning, SC) |
| BFA | Bicycle Friendly America (program of League of American Bicyclists) |
| BFA | Bicycle Friendly Area |
| BFB | Bicycle Friendly Business |
| BFC | Bicycle Friendly Community |
| BHSI | Bicycle Helmet Safety Institute (of America) |
| BIO | Bicycle Industry Organization |
| BIA | Bicycle Institute of America |
| BLC | Bicycle Leadership Conference |
| BLOS | Bicycle Level Of Service |
| BLTS | Bicycle Level Of Traffic Stress |
| BMA | Bicycle Manufacturers Association of America |
| BMX | Bicycle Motocross (Bicycle Moto Cross) |
| BPAC | Bicycle Pedestrian Advisory Committee |
| BPSA | Bicycle Product Suppliers Association |
| BRAIN | Bicycle Retailer and Industry News |
| BRAG | Bicycle Ride Across Georgia |
| BRAN | Bicycle Ride Across Nebraska |
| BSO | Bicycle Shaped Object |
| BTC | Bicycle Technical Committee |
| BTCM | Bicycle Trails Council of Marin (CA) |
| BTCEB | Bicycle Trails Council of the East Bay (CA) |
| BTA | Bicycle Transportation Alliance (Portland, OR) |
| BAM | Bicycling Around Minnesota |
| BFR | Big Fuckin Rock |
| BHAG | Big Hairy Audacious Goal |
| BTNA | Big Talk, No Action |
| BAI | Bike Across Illinois |
| BALL | Bike Across La Louisiane |
| BEST | Bike – Eat – Swim – Tour |
| BMR | Bike Mounted Ranger |
| BRAT | Bike Ride Across Tennessee |
| BRAA | Bike Ride Around Arkansas |
| BTW | Bike Travel Weekend |
| BWAM | Bike Walk Alliance Missoula (MT) |
| BWNC | Bike Walk North Carolina |
| BW | Bike Wash |
| BYTD | Bike Your Park Day |
| BBC | Bikes Belong Coalition |
| BNB | Bikes Not Bombs |
| BAK | Biking Across Kansas |
| BOLT Act | Biking on Long Distance Trails Act S.3264 (2021) |
| BA | Biological Assessment |
| BE | Biological Evaluation |
| BO | Biological Opinion |
| BUMP | Birmingham Urban Mountain Pedalers (AL) |
| BPA | Bisphenol-a |
| BCT | Black Canyon Trail |
| BGDB | Black Girls Do Bike |
| BGR | Black Girls Run |
| BIPOC | Black, Indigenous, People Of Color |
| BLBC | Black Label Bike Club |
| BLM | Black Lives Matter |
| BMT | Black Mountain, NC |
| BAT | Blind Appalachian Trail (Program) |
| BRC | Blue Ribbon Coalition |
| BRO | Blue Ridge Outdoors (magazine) |
| BRP | Blue Ridge Parkway (NC, VA) |
| BEAM | Body Elevation and Movement |
| BMI | Body Mass Index |
| BBP | Boise Bicycle Project (ID) |
| BYRDS | Boise Youth Rider Development Squad (ID) |
| BERT | Bonita Estero Rail Trail (FL) |
| BST | Bonneville Shoreline Trail (UT) |
| B2B | Border to Boston Trail (NH State line to Boston, MA |
| BMB | Boston-Montreal-Boston (bicycle event) |
| BB | Bottom Bracket |
| BSA | Boy Scouts of America |
| BT | Breakthrough |
| BAT | Brevard Area Trails (NC) |
| BYB | Bring Your Bike |
| BYOB | Bring Your Own Bike |
| BBAR | British Best All Rounder |
| BICYCLIST | Broad Investigation of Challenging Yourself, Cycling Lifestyles and Inspiring Sustainable Transportation |
| BASE | Buildings, Antenna, Spans, or Earth (jumping) |
| BTU | British Thermal Unit |
| BT | Bruce Trail (Ontario) |
| BT | Buckeye Trail (OH) |
| BY | Budget Year |
| BOV | Bug-Out Vehicle |
| BANANA | Build Absolutely Nothing Anywhere Near Anything |
| BEIG | Built Environment Image Guide (US Forest Service) |
| BEOS | Built Environment & the Outdoors Summit (KS) |
| BIA | Bureau of Indian Affairs (Department of Interior) |
| BLM | Bureau of Land Management |
| BOR | Bureau of Reclamation (Department of Interior) |
| BOR | Bureau of Outdoor Recreation (defunct) |
| CITO | Cache in Trash Out (Geocaching term) |
| CWT | Cady Way Trail (FL) |
| CYR | Calendar Year |
| CDCA | California Desert Conservation Area |
| CNHT | California National Historic Trail |
| CTUC | California Trail Users Coalition |
| CG | Campground |
| CAMP | Camping Adventures with My Parents (NPS program) |
| CFAR | Cancel For Any Reason (Insurance) |
| CHR | Capacity Heart Range |
| CARS | Capital Area Ride for Safety (Raleigh, NC) |
| CC2ST | Capital City to Sea Trails (FL) |
| CCT | Capital Crescent Trail (DC to MD) |
| CI | Capital Improvement |
| CIP | Capital Investment Program |
| CPR | Cardio Pulmonary Resuscitation |
| CTS | Carmichael Training Systems |
| CMC | Carolina Mountain Club (NC) |
| CW | Casing Width |
| CTA | Catamount Trail Association (Burlington, VT) |
| CE or CX | Categorical Exclusion (NEPA process) |
| CCS | Cellular Confinement Systems (geotextiles) |
| CAT | Center for Appropriate Transport (Eugene, OR) |
| CAMP | Central Alabama Mountain Pedalers |
| CABA | Central Arizona Bicycling Association |
| CEG | Central and Eastern European Greenways |
| CIBA | Central Indiana Bicycling Association |
| COTA | Central Oregon Trail Alliance |
| CROC | Century Ride of the Centuries (OR) |
| CITU | Certificate of Interim Trail Use |
| CCS | Challenge Cost Share agreement (federal) |
| CVB | Chamber & Visitors Bureau |
| CAMBC | Charlottesville Area Mountain Bike Club (VA) |
| CVRR | Chattahoochee Valley Railroad Trail (AL) |
| CAMBA | Chequamegon Area Mountain Bike Association (WI) |
| CABDA | Chicagoland Area Bicycle Dealers Association (Chicago, IL) |
| C&NN | Children & Nature Network |
| CCA | Chromated Copper Arsenate (wood preservative) |
| CSM | Circulation, Sensation, and Motion |
| C4C | Cities For Cycling |
| CSO | Citizen Support Organization |
| CAVE | Citizens Against Virtually Everything |
| CCC | Civilian Conservation Corps (National) |
| CWA | Clean Water Act |
| CL | Clockwise |
| COB | Close of Business |
| CCB | Coal Combustion Byproducts |
| CSHC | Coalition of State Horse Councils |
| CRT | Coalition for Recreational Trails |
| CCCT | Coalition for the Capital Crescent Trail (DC to MD) |
| C2C | Coast-to-Coast Trail (FL) |
| CCORS | Coastal Carolina Off-Road Series (SC) |
| CORRA | Coastal Off-Road Riders Association (SC) |
| CFR | Code of Federal Regulations |
| CTBC | Cola Town Bike Collective (Columbia, SC) |
| CBS | Cold Butt Syndrome |
| CATS | Colorado Addicted Trailbuilders Society |
| CFRT | Colorado Front Range Trail |
| CMTRA | Colorado Motorcycle Trail Riders Association |
| COHVCO | Colorado Off Highway Vehicle Coalition |
| COTI | Colorado Outdoor Training Initiative |
| COPMOBA | Colorado Plateau Mountain Bike Trail Association |
| CT | Colorado Trail |
| COTREX | Colorado Trail Explorer |
| CTF | Colorado Trail Foundation |
| CLP | Collaborative Landscape Planning |
| CO | Collection Agreement |
| CCC | Community Cycling Center (Portland, OR) |
| CDBG | Community Development Block Grants |
| CERT | Community Emergency Response Team |
| CEM | Community Engagement Manager |
| CBL | Commuter Bike League |
| CLWB | Compact Long Wheel Base (recumbent) |
| CTR | Competitive Trail Ride |
| CKD | Completely Knocked Down (dissembled bicycle for shipping) |
| CMP | Comprehensive Management Plan |
| CLIMB | Concerned Long Island Mountain Bicyclists (NY) |
| CORBA | Concerned Off-Road Bicyclists Association (CA) |
| CASM | (Trail) Condition Assessment Survey Matrix |
| CLOMR | Conditional Letter of Map Revision |
| CMAQ | Congestion Mitigation and Air Quality Improvement Program |
| CNU | Congress for the New Urbanism |
| CTC | Connect The Comet (Atlanta, GA) |
| CTTP | Connect Trails To Parks |
| CFPA | Connecticut Forest and Park Association |
| CARL | Conservation and Recreation Lands (FL) |
| CARA | Conservation and Reinvestment Act |
| CE | Conservation Easement |
| CPSC | Consumer Product Safety Commission |
| CDNST | Continental Divide National Scenic Trail |
| CDST | Continental Divide Snowmobile Trail (WY) |
| CDT | Continental Divide Trail |
| CDTA | Continental Divide Trail Alliance |
| CDTC | Continental Divide Trail Coalition |
| CR | Continuing Resolution (Federal Budget) |
| CVT | Continuously Variable Transmission |
| CO | Contracting Officer |
| COR | Contracting Officer’s Representative |
| COTR | Contracting Officer’s Technical Representative |
| CS | Convenience Store |
| CA | Cooperative Agreement |
| CMA | Cooperative Management Agreement |
| CMP | Coordinated Management Plan (BLM) |
| CLR | Corridor Location Review |
| CMP | Corrugated Metal Pipe |
| COG | Council of Governments |
| CEQ | Council on Environmental Quality (defunct) |
| C-CL | Counterclockwise |
| CR | County Road |
| CRABS | Couples Riding A Bicycle Simultaneously |
| CF | Crank Forward (Bicycle) |
| CTREC | Creeper Trail Ride to End Cancer (VA) |
| CBG Trails | Crested Butte & Cunnison (CO) |
| CPTED | Crime Prevention Through Environmental Design |
| CISD | Critical Incident Stress Debriefings |
| XC | Cross-Country (mountain biking) |
| CFG | Cross Florida Greenway |
| CLT | Cross-Laminated Timber |
| CSA | Cross-Sectional Area |
| CST | Cross Seminole Trail (FL) |
| CRABS | Crusty Retired All Recumbent Society (FL) |
| CC | Cubic Centimeter |
| CF | Cubic Feet |
| CFS | Cubic Feet per Second |
| CY | Cubic Yard(s) |
| CRM | Cultural Resource Management |
| CTC | Cumberland Trail Conference |
| CRV | Current Replacement Value |
| CYCLEXMD | Cycle Across Maryland |
| CTT | Cycle Touring Tantrums |
| CTA | Cycle Trades of America |
| CASAz | Cycling Advocates of Southern Arizona |
| CANDISC | Cycling Around North Dakota in Sacajawea Country) |
| COGS | Cyclists of Greater Sylacauga (AL) |
| CTC | Cyclists’ Touring Club (United Kingdom) |
| CTG | Cyclists Travel Guide (Adventure Cycling Association) |
| DORBA | Dallas Off-Road Bicycle Association (TX) |
| DTC | Damascus Trail Center (VA) |
| DOC | Dartmouth Outing Club (Hanover, NH) |
| DLG | Data Line Graph |
| DAR | Daughters of the American Revolution |
| DAL | Dead Ass Last |
| DFL | Dead Fuckin’ Last |
| DB | Decibels |
| DR | Decision Record |
| DDD | Decisions, Decisions, Decisions |
| DG | Decomposed Granite |
| DOG | Decrepit Old Geezer |
| DIRT | Dedicated Individuals for Responsible Trailuse (NY) |
| D2R2 | Deerfield Dir-Road Randonnee (MA) |
| DOTS | Deformity, Open injuries, Tenderness, Swelling |
| DIY | Dehydrate It Yourself |
| D&L | Delaware & Lehigh Trail (PA) |
| DWGNRA | Delaware Water Gap National Recreation Area |
| DOMS | Delayed Onset Muscle Soreness |
| DCR | Department of Conservation & Recreation (VA) |
| DOD | Department of Defense (US) |
| DOE | Department of Energy (US) |
| DOI | Department of Interior (US) |
| DOJ | Department of Justice (US) |
| DNR | Department of Natural Resources (state) |
| DOT | Department of Transportation (federal or state) |
| DOE | Depending On Experience |
| DFMBA | Desert Foothills Mountain Bike Association (AZ) |
| DQ | Design Quantities |
| DFC | Desired Future Condition(s) |
| DTAT | Destination Trail Assessment Tool |
| DNA | Determination of NEPA Adequacy |
| DNS | Determination of Nonsignificance |
| DBB | Detroit Bike & Brunch (MI) |
| DBMX | Devils Backbone Mountain Cross (VA) |
| DRIVE | Developing a Reliable and Innovative Vision for the Economy (Act of 2015) |
| DNF | Did Not Finish |
| DNR | Did Not Race |
| DNS | Did Not Start |
| DEI | Digital Education Initiative |
| DOQ | Digital Orthophoto Quadrangle |
| DRG | Digital Raster Graphic |
| DA | Direct Ascent (Fall Line) |
| DSO | Direct Service Organization |
| DO | Director’s Order |
| DJ | Dirt Jumping |
| DREAM | Disabled Recreation Environmental Access Movement |
| DBE | Disadvantaged Business Enterprises |
| DIC | Disoriented, Irritable, Combative |
| DM | District Manager (BLM) |
| DO | District Office (BLM) |
| DIY | Do It Yourself |
| DNR | Do Nothing Rapidly |
| DWYSYWD | Do What You Say You Will Do |
| DIAD | Done In A Day (trips) |
| DH | Downhill (mountain biking) |
| DEIS | Draft Environmental Impact Statement (NEPA process) |
| DLBM | Drive Less, Bike More |
| DSM | Dual Sport Motorcycle |
| DWR | Durable Water Repellant (fabric coating) |
| ENO | Eagles Nest Outfitters (NC) Hammock company |
| EDI | Earth Discovery Institute (San Diego, CA) |
| EBBP | East Bay Bike Path (RI) |
| ECRRT | East Central Regional Rail Trail (FL) |
| ECG | East Coast Greenway |
| ECGA | East Coast Greenway Alliance |
| EMS | Eastern Mountain Sports (New England outdoor retailer) |
| ESMM | Eat Smart – Move More (Columbia, SC) |
| EHR | Endurance Heart Range |
| E-BIKE Act | Electric Bicycle Incentive Kickstart for the Environment Act (2002) |
| E-MTB | Electric Mountain Bike |
| EPAMD | Electric Personal Assistance Mobility Device |
| ERL | Electronic Road Log |
| ETD | Elevated Trail Design (Trail Contractor) |
| EAP | Emergency Action Plan |
| EMS | Emergency Medical Services |
| EMT | Emergency Medical Technician |
| ERSD | Emergency Response System Decal(s) |
| ERT | Emergency Response Team |
| ELM | Emerging Leaders Program |
| ETL | Emerging Trail Leader(s) |
| EST | Empire State Trail (NY) |
| EOY | End of Year |
| ESA | Endangered Species Act (1973) |
| ESL | Endangered Species List |
| EMP | Ending Measure Point |
| EPI | Ends Per Inch |
| EPA | Enhance, Protect, and Assist |
| EM | Engineering Manual (US Forest Service) |
| EP | Enterprise Program (US Forest Service |
| EA | Environmental Assessment (NEPA process) |
| ECL | Environmental Check List |
| EIS | Environmental Impact Statement (NEPA process) |
| EJ | Environmental Justice |
| EPA | Environmental Protection Agency (US) |
| ESRI | Environmental Systems Research Institute |
| ESA | Environmentally Sensitive Area(s) |
| EEOC | Equal Employment Opportunity Commission |
| ELCR | Equestrian Land Conservation Resource |
| ETACA | Equestrian Trails And Conservation Awareness |
| EFT | Equine Facilitated Therapy |
| ELCR | Equine Land Conservation Resource |
| EDI | Equity, Diversity, Inclusion |
| ECRT | Erie Cattaraugus Rail Trail (NY) |
| ET | Erosion Type |
| EPO | Erythropoietin (blood doping agent) |
| ETA | Estimated Time of Arrival |
| ETD | Estimated Time of Departure |
| ERA | European Rambler’s Association |
| ETRTO | European Tire and Rim Technical Organization |
| EBC | Everglades Bicycle Club (Miami, FL) |
| EID | Excellence in Design (US Forest Service) |
| EO | Executive Order |
| EG | Excessive Grade |
| EX | Existing |
| EPS | Expanded Polystyrene |
| ePTFE | Expanded Polytetrafluoroethylene |
| ERMA | Extensive Recreation Management Area |
| ELD | External Locking Device |
| FAMS | Facility Asset Management System (BLM) |
| FMSS | Facility Management Software System (NPS) |
| FAX | Facsimile message |
| FTAS | Fairfax Trails and Streams (VA) |
| FDGB | Fall Down, Go Boom |
| FTR | Far To the Right (law) |
| FT | Fast-twitch (fiber) |
| FOG | Fat Old Guy |
| FKT | Fastest Known Time |
| FOMO | Fear of Missing Out |
| FACA | Federal Advisory Council Act |
| FAA | Federal Aviation Administration (Department of Transportation) |
| FCC | Federal Communications Commission |
| FEMA | Federal Emergency Management Agency |
| FGDC | Federal Geographic Data Committee |
| FHWA | Federal Highway Administration |
| FICMNEW | Federal Interagency Committee for the Management of Noxious and Exotic Weeds |
| FICT | Federal Interagency Council on Trails |
| FIP | Federal Interim Plan |
| FLAP | Federal Land Access Program |
| FLPMA | Federal Land Policy and Management Act of 1976 |
| FLHP | Federal Lands Highway Program |
| FLREA | Federal Lands Recreation Enhancement Act of 2005 |
| FLTP | Federal Lands Transportation Plan |
| FR | Federal Register |
| FTDS | Federal Trail Data Standards |
| FWOC | Federation of Western Outdoor Clubs |
| FOTE | Feet on the Earth (program) |
| FASLA | Fellow of the American Society of Landscape Architects |
| FRP | Fiberglass Reinforced Polyme |
| FO | Field Office (BLM) |
| FEIS | Final Environmental Impact Statement (NEPA process) |
| FONSI | Finding of No Significant Impact (NEPA process) |
| FLT | Finger Lakes Trail (NY) |
| FAK | First Aid Kit |
| FY | Fiscal Year (Federal FY is from October 1 to September 30) |
| F&G | Fish and Game |
| FWS | Fish and Wildlife Service (Department of Interior) |
| FANY | Five Hundred Miles Across New York |
| FHO(s) | Fixed And Hazardous Object(s) |
| FAST | Fixing America’s Surface Transportation (Act of 2015) |
| FUTS | Flagstaff Urban Trails System (AZ) |
| FTA | Flathead Trails Association (MT) |
| FEGN | Florida Ecological Greenways Network |
| FGCC | Florida Greenways Coordinating Council |
| FGTF | Florida Greenway & Trail Foundation |
| FGTS | Florida Greenways and Trails System |
| FKOHT | Florida Keys Overseas Heritage Trail (Key Largo to Key West, FL) |
| FNST | Florida National Scenic Trail |
| FLORC | Florida Outdoor Recreation Coalition |
| FTBSEP | Florida Traffic and Bicycle Safety Education Program |
| FT | Florida Trail |
| FTA | Florida Trail Association |
| FTHA | Florida Trail Hikers Alliance |
| FTR | Florida Trail Riders (motorcycle club) |
| FFST | Fonta Flora State Trail (NC) |
| FYI | For Your Information |
| FPA | (US) Forest Protection Area |
| FPO | (US) Forest Protection Officer |
| FR | (US) Forest Road |
| FS | (US) Forest Service (US Department of Agriculture) |
| FSH | (US) Forest Service Handbook |
| FSM | (US) Forest Service Manual |
| FSORAG | (US) Forest Service Outdoor Recreation Accessibility Guidelines |
| FSTAG | (US) Forest Service Trail Accessibility Guidelines |
| FSC | Forest Stewardship Council |
| FEAR | Forget Everything And Run |
| FFT | Fort Fraser Trail (FL) |
| 4WD | Four-Wheel Drive Vehicle |
| 4×4 | Four-Wheel Drive Vehicle |
| FOC | Framing Our Community, Inc. |
| FOIA | Freedom of Information Act |
| FBC | Freezer Bag Cooking |
| FAQs | Frequently Asked Questions |
| FART | Friends of Asheville Recreational Trails (FART) |
| FOC | Friends of the Cheat (WV) |
| FOE | Friends of the Earth |
| F3ST | Friends of the Fonta Flora State Trail (NC) |
| FROG | Friends of the Greeneway (North Augusta, SC) |
| FMST | Friends of the Mountains-to-Sea Trail (NC) |
| FoOT | Friends of the Ouachita Trail (Hot Springs, AR) |
| FORT | Friends of the Rail Trail |
| FOTR | Friends of the Rubicon (motorized trail in CA) |
| FWT | Friends of Webster Trails (NY) |
| FSO | From Skin Out |
| FNG | Fucking New Guy |
| FAT | Full Air Technology (bicycle shock) |
| FTE | Full-Time Equivalent |
| FLYERS | Fun Loving Youth En-Route to Success |
| GCC | Gainesville Cycling Club (FL) |
| G&F | Game and Fish |
| GORC | Gateway Off-Road Cyclists (St. Charles, MO) |
| GEMS | Gateways to Environments of Major Significance |
| GAS | Gear Acquirement Syndrome |
| GAO | General Accounting Office (US) |
| GFA | General Forest Area |
| GMP | General Management Plan (NPS) |
| GMR | General Management Review |
| GO | General Obligation (bonds) |
| GSA | General Services Administration (US) |
| GIS | Geographical Information System |
| GATC | Georgia Appalachian Trail Club |
| GRITS | Georgia Rails into Trails Society |
| GARTRA | Georgia Recreational Trail Riders Association |
| GAME | Georgia to Maine (Appalachian Trail) |
| GAMEr | Georgia to Maine (Appalachian Trail thru-hiker heading north) |
| GOOD | Get Out of Dodge |
| GO | Get Outside |
| GTFO | Get The Fuck Outside |
| GSA | Girl Scouts of America |
| GCN | Global Cycling Network |
| GPS | Global Positioning System |
| Glocal | Go Local |
| GPS | Go. Play. See. |
| GSC | Go Shred Constantly |
| GORB | Good Old Rafting Buddy |
| GORP | Good Old Raisins and Peanuts (trail mix) |
| GOCO | Government Owned Commercially Operated |
| GOV | Government Owned Vehicle |
| GPO | Government Printing Office |
| GCPF | Governor’s Council on Physical Fitness |
| GXT | Graded Exercise Test |
| GET | Grand Enchantment Trail (Phoenix, AZ to Albuquerque, NM) |
| GITAP | Grand Illinois Trail & Parks (bicycle ride) |
| GT | Grand Tour |
| GAP | Great Allegheny Passage (MD-PA) |
| GAOA | Great American Outdoors Act |
| GART | Great American Rail Trail |
| GRABAAWR | Great Annual Bicycle Adventure Along the Wisconsin River |
| GBITS | Great Backpacker In The Sky |
| GDMBR | Great Divide Mountain Bike Route |
| GDT | Great Divide Trail (Canada) |
| GDTA | Great Divide Trail Association (Canada) |
| GET | Great Eastern Trail (VA) |
| GETA | Great Eastern Trail Association |
| GOBA | Great Ohio Bicycle Adventure |
| GOBW | Great Old Broads for Wilderness |
| GOCO | Great Outdoors Colorado |
| GPT | Great Plains Trail |
| GPTA | Great Plains Trail Alliance |
| GSMNP | Great Smoky Mountains National Park (NC, TN) |
| GAIT | Greater Aiken Integrated Trails (SC) |
| GOAT | Greatest of All Time |
| GAG | Green Advocacy Group |
| GMC | Green Mountain Club (VT) |
| GMGG | Green Mountain Gavel Growler (VT) |
| GAB | Greenbelts Advisory Board |
| GRT | Greenbrier River Trail (WV) |
| GYF | Greening Youth Foundation |
| GAB | Greenway Advisory Board |
| GAP | Greenway Assistance Program |
| GVW | Gross Vehicle Weight |
| GQTE | Guidelines for a Quality Trail Experience (BLM) |
| HOF | Hall Of Fame |
| HPS | Hantavirus Pulmonary Syndrome |
| HVRT | Harlem Valley Rail Trail (NY) |
| HOHA | Hateful Old Hikers Association |
| HAZMAT | Hazardous Material(s) |
| HQ | Headquarters |
| HAES | Health At Every Size |
| HEAL | Healthy Eating, Active Living |
| HRM | Heart Rate Monitor |
| HRV | Heart Rate Variability |
| SOS | Help (Morse Code distress signal) |
| HCRS | Heritage Conservation Recreation Service |
| HRTCP | Heritage Rail Trail County Park (PA) |
| HR | Heritage Resource |
| HACE | High Altitude Cerebral Edema |
| HAPE | High Altitude Pulmonary Edema |
| HAS | High Altitude Stupid |
| HCMBA | High Country Mountain Bike Association (NC) |
| HDPE | High Density Polyethylene |
| HETAP | High Efficiency Trail Assessment Process |
| HAWK | High Intensity Activated Cross WalK traffic signal |
| HIT or HIIT | High-Intensity Interval Training |
| HSC | High Sierra Camps (in Yosemite National Park) |
| HAM’R | Highest Annual Mileage Record |
| HSIP | Highway Safety Improvement Program |
| HYOH | Hike Your Own Hike |
| HASTE | Hiker Awareness, Safety, and Trail Education |
| HTA | Hiking Trails for America |
| HE | Historic Erosion |
| HRS | Historic Resource Study |
| HRTC | Hoosier Rails-To-Trails Council |
| HI | Hostelling International |
| HI-AYH | Hostelling International – American Youth Hostels (now HI-USA) |
| HI-USA | Hostelling International – USA |
| HS | Hot Shower |
| HH100 | Hotter’n Hell Hundred (Wichita Falls, TX cycling event) |
| HHH | Hotter’n Hell Hundred (Wichita Falls, TX cycling event) |
| HPD | Hours per Day |
| HUD | (Department of) Housing and Urban Development |
| HAMBRA | Houston Area Mountain Bike Riders Association (TX) |
| HHC | Huachuca Hiking Club (Sierra Vista, AZ) |
| HCM | Human Capital Management (US Forest Service) |
| HGH | Human Growth Hormone |
| HPA | Human Powered Aircraft |
| HPB | Human Powered Boat |
| HPS | Human Powered Submarine |
| HPUV | Human Powered Utility Vehicle |
| HPV | Human Powered Vehicle |
| HPVA | Human Powered Vehicle Association |
| HAMR | Huntsville Area Mountain Bike Riders (AL) |
| HIF | Hypoxia-Inducible-Factor |
| IANST | Ice Age National Scenic Trail |
| IAPTF | Ice Age Park And Trail Foundation |
| IAT | Ice Age Trail |
| IDHSMBR | Idaho Hot Springs Mountain Bike Route |
| INHT | Iditarod National Historic Trail |
| ITB | Iliotibial Band |
| IPP | Illinois Prairie Path (IL) |
| ISD | Impairment, Suppression, Displacement (syndrome) |
| ICE | In Case of Emergency |
| IRL | In Real Life |
| ICS | Incident Command System |
| IDIQ | Indefinite Delivery, Indefinite Quanity (contract) |
| IPS | Independent Pedal System (tandem bicycle) |
| ITF | Indiana Trails Fund |
| IWM | Individual Without Motorcycle |
| IHTC | Industrial Heartland Trails Network (PA, OH, WV, NY) |
| IK | Inflatable Kayak |
| IT | Informal Trail(s) |
| IR | Infrared Radiation |
| INFRA | Infrastructure Database (US Forest Service) |
| IBPI | Initiative For Bicycle and Pedestrian Innovation (Portland State University, OR) |
| ICF | Instructor Certification Program (IMBA) |
| ITT | Independent Time Trial |
| IA | Inter/Intra-Agency Agreement |
| ITDS | Interagency Trail Data Standards |
| IOCA | Intercollegiate Outing Club Association |
| ITS | Interconnected Trail System |
| ID | Interdisciplinary |
| IDT | Interdisciplinary Team |
| IP | Interested Public(s) |
| IGA | Intergovernmental Agreement |
| IBLA | Interior Board Of Land Appeals |
| ISTEA | Intermodal Surface Transportation Efficiency Act of 1991 |
| IAT | International Appalachian Trail |
| IAAF | International Association Of Athletics Federation |
| IAU | International Association Of Ultrarunners |
| IBTS | International Bicycle Touring Society |
| IBC | International Building Code |
| ICC | International Code Council |
| ICORE | International Conference On Recreation and Education |
| ICHC | International Cycling History Conference |
| IMBA | International Mountain Bicycling Association |
| INOVAA | International Off-Highway Vehicle Administration Association |
| INOHVPAA | International Off-Highway Vehicle Program Administrators Association |
| IOS | International Organization For Standardization |
| IOF | International Orienteering Federation |
| IPMBA | International Police Mountain Bike Association |
| ISIA | International Snowmobile Industry Association |
| ISMA | International Snowmobile Manufacturers Association |
| ISIS | International Splined Interface Standard (specification for the interface between a bicycle crankset and the bottom bracket spindle) |
| ISA | International Symbol of Accessibility |
| ITRA | International Trail Running Association |
| ITGC | International Trails And Greenways Conference |
| ITA | International Triathlon Union |
| IVCA | International Veteran Cycling Association |
| IYHF | International Youth Hostel Federation (now Hosteling International) |
| ICC | Interstate Commerce Commission (replaced by the STB) |
| I&M | Inventory & Monitoring |
| IFB | Invitation For Bid |
| ILRT | Island Line Rail Trail (VT) |
| IST | Isolated Leg Training |
| ICOs | Issues, Concerns, And Opportunities |
| IWLA or IWL | Izaak Walton League of America |
| JBTR | Jim Bridger Trail Run (Bozeman, MT) |
| MT | John Muir Trail (CA) |
| JWT | John Wayne Trail (WA) |
| JOMO | Joy Of Missing Out |
| JBANHT | Juan Bautista de Anza National Historic Trail |
| JRA | Just Riding Along |
| JEDI | Justice, Equity, Diversity, and Inclusion |
| KOA | Kampgrounds of America |
| KTC | Kansas Trails Council |
| KISAIS | Keep It Simple, As It Is |
| KISS | Keep It Simple Stupid |
| KyMBA | Kentucky Mountain Bike Association |
| KEG | Key Emergency Gear |
| KOP | Key Observation Point |
| KPI | Key Performance Indicator(s) |
| KTA | Keystone Trails Association (PA) |
| KIP | Kids In Parks |
| KM | Kilometer |
| KOM | King Of The Mountain |
| KSA | Knowledge, Skills, and Abilities |
| KLRF | Kodak Liberty Ride Festival (May 18, 1986) |
| LT | Lactate Threshold |
| LTHR | Lactate Threshold Heart Rate |
| LC | Large Campsite |
| LWCF | Land and Water Conservation Fund |
| LIAA | Land Information Access Association (MI) |
| LUP | Land Use Plan |
| LG | Landform Grade |
| LIDAR | Laser Illuminated Detection and Ranging |
| LATTE | LIDAR Assisted Trail Topography Evaluation |
| LIFO | Last In, First Out |
| Lat/Long or Lat/Lon | Latitude/Longitude |
| LE | Law Enforcement |
| LEO | Law Enforcement Officer |
| LEED | Leadership in Energy and Environmental Design |
| LTC | Leadership Training Course |
| LCI | League (of American Bicyclists) Cycling Instructor |
| LAB | League of American Bicyclists |
| LAW | League of American Wheelmen (now LAB) |
| LMB | League of Michigan Bicyclists |
| LNT | Leave No Trace |
| LLD | Leg Length Discrepancy |
| LOI | Letter of Intent |
| LOMR | Letter of Map Revision |
| LOR | Level of Responsiveness |
| LOS | Level of Service |
| LTS | Level of Traffic Stress |
| LCNHT | Lewis and Clark National Historic Trail |
| LIDAR | Light Detection and Ranging |
| LEVA | Light Electric Vehicle Association |
| LED | Light-Emitting Diode |
| LAC | Limits of Acceptable Change |
| LF | Linear Foot (Feet) |
| LMST | Little Miami Scenic Trail (OH) |
| LYOL | Live Your Own Life |
| LBS | Local Bike Shop(s) |
| LEM | Local Experienced Men |
| LMPG | Local Management Planning Guide |
| LULU | Locally Undesirable Land Use |
| LULU | Locally Unpopular Land Use |
| LASHer | Long Ass Section Hiker |
| LDH | Long Distance Hiker |
| LRTP | Long Range Transportation Plan |
| LSD | Long Slow Distance (training) |
| LWB | Long Wheel Base (recumbent) |
| LACBC | Los Angeles County Bicycle Coalition |
| LBTN | Louisiana Bootlace Trail Network |
| LDL | Low Density Layer |
| LDPE | Low Density Polyethylene |
| LIMB | Low Impact Mountain Bicyclists of Missoula (MT) |
| LS | Lump Sum |
| LSQ | Lump Sum Quantities |
| MCT | Madison County Trails (IL) |
| MEGA | Maine to Georgia (Appalachian Trail thru-hiker heading south) |
| MATC | Maine Appalachian Trail Club |
| MHT | Maine Huts and Trails |
| MITA | Maine Island Trail Association (Portland, ME) |
| MTC | Maine Trail Crew |
| MTT | Major Taylor Trail (IL) |
| MAD | Make a Difference |
| MYOG | Make Your Own Gear |
| MFP | Management Framework Plan (BLM) (now RMP) |
| MUTCD | Manual of Uniform Traffic Control Devices |
| MSRP | Manufacturer’s Suggested Retail Price |
| MCBC | Marin County Bicycle Coalition (CA) |
| MORE | Marine and Off Road Vehicle Enforcement |
| MAMBD | Maryland Association of Mountain Bike Operators |
| M-NCPPC | Maryland-National Capital Park & Planning Commission |
| MOOP | Matter Out of Place |
| MHR | Maximum Heart Rate |
| MTA | McDowell Trails Association (NC) |
| MSL | Mean Sea Level |
| MM | Meaningful Measures (US Forest Service) |
| MOI | Mechanism of Injury |
| MBC | Melanin Base Camp |
| MOA | Memorandum of Agreement |
| MOU | Memorandum of Understanding |
| MRSA | Methicillian-resistent staphylococcus aureus |
| MAUDEP | Metropolitan Association of Urban Designers and Environmental Planners |
| MBT | Metropolitan Branch Trail (Washington, DC |
| MPO | Metropolitan Planning Organization |
| MSA | Metropolitan Statistical Area |
| MTAC | Michigan Trails Advisory Committee |
| MTGA | Michigan Trails and Greenways Alliance |
| MUP | Michigan’s Upper Peninsula (bicycle tour) |
| MATAG | Mid-American Trails & Greenway (Conference) |
| MORE | Mid-Atlantic Off-Road Enthusiasts (VA) |
| MST | Mid State Trail (PA) |
| MAMIL | Middle Aged Men In Lycra |
| MP | Milepost |
| MPD | Miles per Day |
| MPH | Miles per Hour |
| MPG | Miles per Gallon |
| MGRS | Military Grid Reference System |
| MSRS | Milled Shoulder Rumble Strip(s) |
| MBSR | Mindfulness-Based Stress Reduction |
| MUDs | Mindless Ups and Downs (several PUDs in a row) |
| MTRP | Mission Trails Regional Park (San Diego, CA) |
| MRT | Mississippi River Trail (Bikeway) |
| MTDC | Missoula Technology and Development Center (US Forest Service) |
| MoRIT | Missouri Rock Island Trail |
| MHBHT | Mohawk Hudson Bike-Hike Trail (NY) |
| MYTC | Mon/Yough Trail Council (PA) |
| MRTC | Mon River Trails Conservancy (Morgantown, WV) |
| MT | Monon Trail (IN) |
| MTVRA | Montana Trail Vehicle Riders Association |
| MTR | Montreat, NC |
| MPNHT | Mormon Pioneer National Historic Trail |
| MAYA | Most Advanced Yet Acceptable |
| MVH | Most Valuable Hiker |
| MX | Motocross |
| MVUM | Motor Vehicle Use Map (US Forest Service) |
| MIC | Motorcycle Industry Council |
| MTR | Motorized |
| MRATC | Mount Rogers Appalachian Trail Club (VA) |
| MTTA | Mount Tahoma Trail Association (WA) |
| MTB | Mountain Bike or Mountain Biking |
| MBA | Mountain Bike Action (magazine) |
| MBAA | Mountain Bike Association of Arizona |
| MTBHOF | Mountain Bike Hall of Fame |
| MBR | Mountain Bike Route |
| MBOSC | Mountain Bikers of Santa Cruz (CA) |
| MCM | Mountain Club of Maryland |
| MSR | Mountain Safety Research |
| MSF | Mountain Sports Festival (Asheville, NC) |
| MTF | Mountain Trails Foundation (Park City, UT) |
| MCA | Mountaineering Club of Alaska |
| MST | Mountains-to-Sea Trail (NC) |
| MTSG | Mountains to Sound Greenway (Seattle, WA) |
| MTSGT | Mountains to Sound Greenway Trust (Seattle, WA) |
| MIMO | Move In / Move out (mobilization) |
| MEAT | Movement, Exercise, Analgesia, Treatment |
| MAP-21 | Moving Ahead for Progress in the 21st Century |
| MONA | Moving Outdoors in Nature Act (HR 6426) 2010, renamed Healthy Kids Outdoor Act 2014 |
| MS | Muddy Soil |
| MIPS | Multi-directional Impact Protection System (for helmets) |
| MOHUV | Multi-Purpose Off-Highway Utility Vehicle |
| MrSID | Multi-Resolution Seamless Image Database |
| MYTH | Multi-Year Thru Hike |
| MUTS | Munds Park Trail Stewards (AZ) |
| MOMBAT | Museum of Mountain Bike Art & Technology (Statesville, NC) |
| MBA² | Myrtle Beach Area Mountain Biking Association (SC |
| DEET | N, N-diethyl-meta-toluamide (Insect Repellant) |
| NUMBA | Naked Underwater Mountain Bike Association |
| NAP | Name, Address, Phone Number |
| NHC | Nantahala Hiking Club |
| NOC | Nantahala Outdoor Center (Wesser, NC) |
| NTNST | Natchez Trace National Scenic Trail |
| NTT | Natchez Trace National Scenic Trail |
| NACTO | National Association of City Transportation Officials |
| NACPRO | National Association of County Parks and Recreation Officials |
| NAOPM | National Association of OHV Program Managers |
| NASORLO | National Association of Outdoor Recreation Liaison Officers |
| NARRP | National Association of Recreation Resource Planners |
| NARPO | National Association of Reversionary Property Owners |
| NASCC | National Association of State Conservation Corps |
| NASORLO | National Association of State Outdoor Recreation Liaison Officers |
| NASPD | National Association of State Park Directors |
| NASRP | National Association of State Recreation Planners |
| NASTA | National Association of State Trail Administrators |
| NBCB | National Backcountry Byway |
| NBDA | National Bicycle Dealers Association |
| NBG | National Bicycle Greenway |
| NBWS | National Bicycling and Walking Study |
| NBC | National Bike Challenge |
| NBC | National Brotherhood of Cyclists |
| NCBW | National Center for Bicycling and Walking |
| NCCA | National Collegiate Cycling Association |
| NCUTCD | National Committee on Uniform Traffic Control Devices |
| NCUTLO | National Committee on Uniform Traffic Laws and Ordinance |
| NCA | National Conservation Area |
| NCTC | National Conservation Training Center (FWS) |
| NDT | National Digital Trails |
| NDT | National Discovery Trail |
| NDTA | National Discovery Trail Act |
| NEEF | National Environmental Education Foundation |
| NEPA | National Environmental Policy Act (1969) |
| NATETC | National Equestrian Trails Conference |
| NETC | National Equestrian Trails Conference |
| NF | National Forest |
| NFMA | National Forest Management Act (1976) |
| NFS | National Forest Service |
| NFS | National Forest System |
| NFSR | National Forest System Road |
| GO Day | National Get Outdoors Day |
| NGB | National Governing Body |
| NHA | National Heritage Area |
| NHI | National Highway Institute |
| NHS | National Highway System |
| NHTSA | National Highway Traffic Safety Administration |
| NHL | National Historic Landmark |
| NHPA | National Historic Preservation Act (1966) |
| NHT | National Historic Trail |
| NHP | National Historical Park |
| NICA | National Interscholastic Cycling Association |
| NLCS | National Landscape Conservation System |
| NMAS | National Map Accuracy Standards |
| NMT | National Memorial Trail (to honor the fallen of the September 11, 2001 terrorist attacks) |
| NM | National Monument |
| NMBP | National Mountain Bike Patrol |
| NNL | National Natural Landmark |
| NOHVCC | National Off-Highway Vehicle Conservation Council |
| NOAPM | National OHV Association of Program Managers |
| NORBA | National Off-Road Bicycling Association |
| NOBA | National Outdoor Book Awards |
| NORC | National Outdoor Recreation Conference |
| NONA | National Outstanding Natural Area |
| NP | National Park |
| NPS | National Park Service (USDI) |
| NPCA | National Parks Conservation Association |
| NPAP | National Physical Activity Plan |
| NPAPA | National Physical Activity Plan Alliance |
| NPLD | National Public Lands Day |
| NRA | National Recreation Area |
| NRPA | National Recreation and Park Association |
| NRT | National Recreation Trail |
| NRTF | National Recreation Trail Fund |
| NRUM | National Recreation Use Monitoring |
| NRTAC | National Recreational Trails Advisory Committee |
| NRHP | National Register of Historic Places |
| NRRA | National River & Recreation Area |
| NSA | National Scenic Area |
| NSB | National Scenic Byway |
| NST | National Scenic Trail |
| NSHT | National Scenic and Historic Trails |
| NSRE | National Survey on Recreation and the Environment |
| NTDP | National Technology and Development Program (US Forest Service) |
| NTAR | National Trail Administrators Round Table |
| NTD | National Trails Day |
| NTS | National Trails System |
| NTSA | National Trails System Act, 16 USD 1241 et seq. (1968) |
| NTSAHA | National Trails System Administrative History Archive |
| NTSC | National Trails System Council |
| NTTP | National Trails Training Partnership |
| NTC | National Training Center (BLM) |
| NTEC | National Transportation Enhancements Clearinghouse |
| NUVM | National Visitor Use Monitoring Survey |
| NVP | National Volunteer Project |
| NWT | National Water Trail |
| NWTS | National Water Trail System |
| NWF | National Wildlife Federation |
| NWR | National Wildlife Refuge |
| NYPUM | National Youth Project Using Minibikes |
| NRCS | Natural Resources Conservation Service (formerly the Soil Conservation Service) under the USDA |
| NT | Natural Terrain |
| NORC | Naturally Occurring Retirement Community |
| NUMB | NE United Methodists Bike Ride for Hunger (NE) |
| NEMBA | New England Mountain Bike Association |
| NEOC | New England Orienteering Club |
| NET | New England Trail (CT, NH, MA) |
| NETC | New England Trail Conference |
| NMOHVA | New Mexico Off Highway Vehicle Alliance |
| NMRTA | New Mexico Rails to Trails Association |
| NOS | New, Old Stock (classic parts and accessories that have never been sold or put into use) |
| NRT | New River Trail (VA) |
| NUC | New Urbanism Community |
| NYCMTB | New York City Mountain Bike Association |
| NYNJTC | New York-New Jersey Trail Conference |
| Nm | Newton-meters |
| NPNHT | Nez Perce National Historic Trail |
| NPNHTF | Nez Perce National Historic Trail Foundation |
| NIMBY | Nightmare In My Backyard |
| NoBo | No Boundaries |
| NP | No Pets |
| NGO | Non-Governmental Organization |
| NMTR | Non-motorized |
| NMV | Non-Motorized Vehicle |
| NITRO | None In The Right Order |
| NEABA | North Alabama Bicycle Association |
| NAD27 | North American Datum of 1927 |
| NAD27 CONUS | North American Datum of 1927 Continental United States |
| NAD83 | North American Datum of 1983 |
| NAHBS | North American Handmade Bicycle Show |
| NARR | North American River Runners |
| NATRC | North American Trail Ride Conference |
| NAWTA | North American Water Trails Association |
| NCBF | North Carolina Bicycle Federation |
| NCHPTA | North Carolina High Peaks Trail Association |
| NCMST | North Carolina Mountains-to-Sea Trail |
| NCRT | North Carolina Rail Trails (organization) |
| NCNST | North Country National Scenic Trail |
| NCT | North Country Trail |
| NCTA | North Country Trail Association |
| NICTF | North Idaho Centennial Trail Foundation |
| NSMA | North Shore Mountain Bike Association (Vancouver, BC, Canada) |
| NOBO | Northbound (thru-hiker) |
| NEABA | Northeast Alabama Bicycle Association |
| NWTA | Northwest Trail Alliance (Portland, OR) |
| NA | Not Applicable |
| NIMBY | Not in My Back Yard |
| NTE | Not to Exceed |
| NUTS | Nothing Under The Sun |
| NOA | Notice of Appeal |
| NOA | Notice of Availability |
| NOI | Notice of Intent (NEPA) |
| NITU | Notice of Interim Trail Use (Rail-Trail) |
| OMBA | Ocala Mountain Bike Association (FL) |
| OSHA | Occupational Safety and Health Administration |
| OTLHT | Ocean to Lake Hiking Trail (FL) |
| OBBT | Ochlockonee Bay Bike Trail (FL) |
| OD | Off Day |
| OHMVR | Ovv-Highway Motor Vehicle Recreation Commission (CA) |
| OHM | Off-Highway Motorcycle |
| OHMV | Off-Highway Motorized Vehicle |
| OHR | Off-Highway Recreation |
| OHV | Off-Highway Vehicle |
| OHVAG | Off-Highway Vehicle Advisory Group |
| ORAMM | Off-Road Assault on Mount Mitchell (NC) |
| ORBA | Off Road Business Association |
| ORM | Off-Road Motorcycle |
| ORV | Off-Road Vehicle |
| OTBP | Off The Beaten Path |
| OH | Office Hours |
| OGT | Office of Greenways and Trails (FL) |
| OMB | Office of Management & Budget (US) |
| OTET | Ohio To Erie Trail |
| OTP | Ohio Trails Partnership |
| ODATC | Old Dominion Appalachian Trail Club (VA) |
| OHA | Old Hutcroo Association |
| OST | Old Spanish Trail |
| OSTA | Old Spanish Trail Association |
| ODT | Olympic Discovery Trail (WA) |
| OTC | Olympic Training Center |
| ODS | Omni-Directional Suspension |
| OJT | On the Job Training |
| OATBRAN | One Awesome Tour Bike Ride Across Nevada |
| OHIO | Only handle it once |
| OPSP | Open Project Selection Process |
| O&M | Operations and Maintenance (costs) |
| OLR | Optimal Location Review |
| OS | Optimistic Skepticism |
| OLR | Optimal Location Review |
| OLR | Optimum Location Review |
| OBRA | Oregon Bicycle Racing Association |
| OCTA | Oregon-California Trails Association |
| ONHT | Oregon National Historic Trail |
| OT | Oregon Trail |
| Org | Organization |
| OEM | Original Equipment Manufacturer |
| OPDMD | Other Power Driven Mobility Device |
| OT | Ouachita Trail (Hot Springs, AR) |
| OFM | Out-comes Focused Management |
| OAI | Outdoor Access Initiative |
| OALT | Outdoor Afro Leadership Team |
| OEDC | Outdoor Economic Development Collaborative (WV) |
| OGB | Outdoor Gear Builders (Western North Carolina) |
| OIWC | Outdoor Industries Women’s Coalition |
| ODJT | Outdoor Journal Tour |
| ORAR | Outdoor Recreation Access Route |
| ORCA | Outdoor Recreation Coalition of America |
| ORP | Outdoor Recreation Planner |
| ORRRC | Outdoor Recreation Resources Review Commission (1962) |
| ORSA | Outdoor Recreation Satellite Account |
| OSI | Outdoor Stewardship Institute (CO) |
| OEN | Outdoors Empowered Network |
| ONA | Outstanding Natural Area |
| OB | Outward Bound |
| OBA | Outward Bound Adventures |
| OSS | Over Seat Steering (recumbent) |
| OSV | Over Snow Vehicle |
| OTB | Over the Bars or Off the Back or Only the Best |
| OTC | Over The Counter (medicine) |
| OVNHT | Overmountain Victory National Historic Trail |
| OHT | Ozark Highland Trail (MO) |
| OT | Ozark Trail (MO) |
| OTA | Ozark Trail Association (MO) |
| PAC | Pacific Atlantic Cycling (Tour) |
| PCNST | Pacific Crest National Scenic Trail |
| PCT | Pacific Crest Trail |
| PCT-L | Pacific Crest Trail (e-mail List) |
| PCTA | Pacific Crest Trail Association |
| PCTC | Pacific Crest Trail Conference |
| PNT | Pacific Northwest Trail (Canada) |
| PITC | Palisades Interstate Trail Conference (now New York-New Jersey Trail Conference) |
| PASTA | Palmetto State Triathlon Association (SC) |
| PT | Palmetto Trail (SC) |
| PBP | Paris-Brest-Paris (bicycle event) |
| PRIP | Park Repair and Improvement Program |
| P2P | Parkersburg to Pittsburgh (WV, PA) |
| POST | Parks, Open Space and Trails |
| PARD | Parks and Recreation Development Fund (SC) |
| PTNY | Parks & Trails New York |
| PA | Participating Agreement |
| PNTS | Partnership for the National Trails System |
| PLP | Path Less Pedaled |
| PB&J | Peanut Butter and Jelly (sandwich) |
| PALM | Pedal Across Lower Michigan |
| PAC | Pedal Across the Continent |
| PALM | Pedal Around Lake Michigan |
| PBIC | Pedestrian and Bicycle Information Center |
| PBIN | Pedestrian and Bicycle Infrastructure Network |
| PHB | Pedestrian Hybrid Beacon |
| PELICAN | PEdestrian LIght Control ActivatioN traffic crossing |
| PSRS | Pedestrian Safety Roadshow (1998) |
| PTC | Peninsula Trails Coalition (WA) |
| PFB | PeoopleForBikes (National Association) |
| PATH | People of Atlanta for Trails Here (GA) |
| PWD | People With Disabilities |
| PCT | Perfect Cycling Trail (Pacific Crest Trail) |
| PED | Performance-Enhancing Drug |
| PFT | Permanent Full Time |
| PB | Personal Best |
| PFD | Personal Flotation Device (lifejacket) |
| PLB | Personal Location Beacon or Personal Locator Beacon |
| PMD | Personal Mobility Device |
| PPE | Personal Protective Equipment |
| PR | Personal Record |
| PWC | Personal Watercraft |
| PAOT | Persons at One Time (US Forest Service) |
| PPORA | Pikes Peak Outdoor Recreation Alliance (CO) |
| PMTA | Pine Mountain Trail Association (GA) |
| PTI | Pinellas Trail, Inc. (FL) |
| PAS | Pisgah Area SORBA (NC) |
| PMBAR | Pisgah Mountain Bike Adventure Race (NC) |
| PMTCC | Pittsburgh Major Taylor Cycling Club (PA) |
| PUD | Planned Unit Development |
| PRTT | Platte River Trails Trust (Casper, WY) |
| POC | Point of Contact |
| POV | Point of View |
| PLS | Point Last Scene |
| PSC | Pointless Stream Crossings (where trail zig zags across a stream) |
| PUDs | Pointless Ups and Downs (where a climb leads to no view) |
| PCC | Poison Control Center |
| PAL | Police Activity (formally Athletic) League |
| PC | Polycarbonate |
| PTFE | Polytetrafluoroethylene |
| PU | Polyurethane |
| PVC | Polyvinyl Chloride (plastic) |
| PENHT | Pony Express National Historic Trail |
| PJ | Port-a-John(s) |
| PODS | Portable on Demand Storage |
| PUMP | Portland United Mountain Pedalers (OR) |
| PD | Position Description |
| PMA | Positive Mental Attitude |
| PhD | Post Hole Digger |
| PO | Post Office |
| PATC | Potomac Appalachian Trail Club (Washington, DC) |
| PHNST | Potomac Heritage National Scenic Trail |
| PHT | Potomac Heritage Trail |
| PSF | Pounds Per Square Foot |
| PSI | Pounds Per Square Inch |
| PAS | Power Assisted |
| POD | Power On Demand |
| PAL | Predictable, Alert, Lawful |
| PCAO | President’s Commission on Americans Outdoors (1987) |
| PCPFS | President’s Council on Physical Fitness and Sports |
| PSAR | Preventive Search and Rescue (program) |
| PMO | Primary Management Objective (US Forest Service) |
| POV | Privately Owned Vehicle |
| POV | Privately Owned Vehicle |
| PA | Problem Area |
| PBMA | Professional Bicycle Mechanics Association |
| PTBA | Professional Trailbuilders Association |
| POMS | Profile of Mood States (test) |
| PCE | Programmatic Categorical Exclusion |
| PEIS | Programmatic Environmental Impact Statement |
| PPS | Project for Public Spaces |
| PC | Property Corner |
| PL | Property Line |
| PETS | Proposed, Endangered, Threatened, or Sensitive species |
| PNF | Proprioceptive Neuromuscular Facilitation (Exercises) |
| PEAK | Promoting Environmental Awareness in Kids |
| PATHE | Protecting the Appalachian Trail Experience Program |
| PAM | Public Access Map |
| PARVS | Public Area Recreation Visitor Study |
| PLS | Public Land Solutions (UT) |
| PLF | Public Lands Foundation |
| PLH | Public Lands Highways |
| PLI | Public Lands Initiative |
| P.L. | Public Law |
| Prowap | Public Rights-of-Way Assessment Process (Beneficial Designs) |
| PUC | Public Use Condition |
| PUC | Public Utilities Commission |
| PBJ | Pump, Berm, Jump (line) |
| PO | Purchase Order |
| QA/QC | Quality Assurance/Quality Control |
| QAR | Quality Assistance Review |
| QBP | Quality Bicycle Products |
| QOTD | Question Of The Day |
| QR | Quick Response (code) |
| QUC | Quiet Use Coalition |
| QTIP | Quit Taking It Personally |
| RRVT | Raccoon River Valley Trail (IA) |
| RRVTA | Raccoon River Valley Trail Association (IA) |
| RAAM | Race Across America |
| RPR | Race Performance Range (Heartbeat) |
| RR | Railroad |
| 4R | Railroad Revitalization and Regulatory Reform Act |
| RT | Rail-Trail |
| RTC | Rail Trail Council |
| R2T | Rail(s)-to-Trail(s) |
| RTC | Rails-to-Trails Conservancy |
| RTCPA | Rails-to-Trails of Central Pennsylvania |
| RWT | Rail(s)-with-Trail(s) |
| RRPM | Raised Reflective Pavement Marker |
| RMC | Randolph Mountain Club (NH) |
| RD | Ranger District (US Forest Service) |
| RTE’s | Rare, Threatened and Endangered Species |
| RPE | Ratings of Perceived Exertion |
| RPT | Reactive Protective Technology |
| RTFM | Read The Fucking Manual |
| RWD | Rear Wheel Drive |
| RAISE | Rebuilding American Infrastructure with Sustainability and Equity (grant) |
| RE | Recent Erosion |
| RECREATE | Reclaiming the Cheat River as an Economic Asset through Trail Enhancement (WV) |
| RDA | Recommended Dietary Allowance |
| ROD | Record of Decision (NEPA process) |
| Rec | Recreation |
| R&PP | Recreation and Public Purposes (Act) |
| RAMP | Recreation Activity/Area Management Plan |
| RA | Recreation Area |
| REA | Recreation Enhancement Act |
| RIMS | Recreation Impact Monitoring System |
| RIDE | Recreation for Individuals Dedicated to the Environment |
| RIM | Recreation Information Management (US Forest Service) |
| RMA | Recreation Management Area |
| RMIS | Recreation Management Information System |
| RMP | Recreation Management Plan |
| ROS | Recreation Opportunity Spectrum |
| RRIS | Recreation Resource Information System (US Forest Service) |
| RSC | Recreation Setting Characteristics |
| RUP | Recreation Use Permit |
| RVD | Recreation Visitor Day (US Forest Service) |
| REI | Recreational Equipment, Inc. |
| ROV | Recreational Off-Highway Vehicle |
| ROHVO | Recreational Off-Highway Vehicle Organization |
| ROAD | Recreational Outdoor Accessibility for the Disabled |
| RTV | Recreational Trail Vehicle |
| RTAB | Recreational Trails Advisory Board |
| RTP | Recreational Trails Program (Federal grant program) |
| RUS | Recreational Use Statute |
| RUV | Recreational Utility Vehicle |
| RV | Recreational Vehicle (travel trailer, motorhome, 5th-wheel, etc.) |
| RVIA | Recreational Vehicle Industry Association |
| RIF | Reduction in Force |
| RLC | Regional Leadership Council(s) (IMBA) |
| RO | Regional Office (US Forest Service) |
| RPA | Regional Planning Agency |
| RTC | Regional Trail Corporation (PA) |
| RTTP | Regional Trails Training Program (American Trails) |
| RAGBRAI | Register’s Annual Great Bike Ride Across Iowa |
| REGNEG | REGulatory NEGotiating Committee on Accessibility Guidelines for Outdoor Developed Areas |
| RW | Reliable Water |
| RSI | Repetitive Strain Injury |
| RFB | Request for Bid |
| RCA | Request for Contract Action |
| RFP | Request for Proposal |
| RFQ | Request for Quotes (quotation, qualifications) |
| RHAP | Rescued Horses Assisting People |
| R&D | Research & Development |
| RNA | Research Natural Area |
| RCPA | Residents’ Committee to Protect the Adirondacks |
| RAC | Resource Advisory Council |
| RAT | Resource Allocation Team |
| RMA | Resource Management Area |
| RMP | Resource Management Plan |
| RISE | Respectful, Inclusive, Safe, Enjoyable |
| RDS | Responsible Down Standard |
| ROMP | Responsible Organized Mountain Pedalers (Silicon Valley, CA) |
| RRR | Rest and Recovery Range (Heartbeat) |
| ROW | Rest of the World |
| RICE | Rest, Ice, Compression, and Elevation |
| RHR | Resting Heart Rate |
| ROROL | Restoring Ourselves, Restoring Our Lands |
| RUA | Restricted Use Area |
| RIP | Retired In Place |
| RSVP | Retired Senior Volunteer Program |
| ROI | Return On Investment |
| RPM | Revolutions Per Minute |
| RABA | Richmond Area Bicycle Association (VA) |
| RCC | Richmond Cycling Corps (VA) |
| RAIN | Ride Across Indiana |
| RAINSTORM | Ride Across Indiana: Same Thing, Only Ride More |
| RASDAK | Ride Across South Dakota |
| RAMROD | Ride Around Mount Rainer in One Day (WA) |
| RAW | Ride Around Washington |
| RSVP | Ride from Seattle to Vancouver |
| ROS, RofS | Ride of Silence |
| RWR | Ride With Respect (Moab, UT) |
| RYOR | Ride Your Own Ride |
| RIDE | Riders Inspiring Diversity and Equality |
| ROW | Right(s)-Of-Way (also R/W) |
| RHI | Rigid Hull Inflatable |
| RMZ | Riparian Management Zone |
| RMS | River Management Society |
| RTCA | Rivers, Trails and Conservation Assistance Program (of the NPS) |
| RSA | Road Safety Audit |
| R2T | Road to Trail (conversion) |
| RAP | Roads Analysis Process |
| R&T | Roads and Trails (NPS) |
| RARE | Roadless Area Review and Evaluation (RARE I and II) |
| RATC | Roanoke Appalachian Trail Club (VA) |
| RMYC | Rocky Mountain Youth Corps |
| RGD | Rolling Grade Dip |
| ROPS | Rollover Protective Structure |
| RSF | Rough Stuff Fellowship (United Kingdom) |
| RTV | Rough Terrain Vehicle |
| ROC | Rutherford Outdoor Coalition (NC) |
| SAFETEA-LU | Safe, Accountable, Flexible, Efficient Transportation Equity Act―A Legacy for Users of 2005 |
| SRTS | Safe Routes To School |
| SHIPS | Safety and Health Information Portal System (US Forest Service) |
| SFNHT | Santa Fe National Historic Trail |
| SDCBC | San Diego County Bicycle Coalition (CA) |
| SDTDC | San Dimas Technology and Development Center (US Forest Service) |
| SFBC | San Francisco Bicycle Coalition |
| SART | Santa Ana River Trail (CA) |
| SCORR | Sarasota County Off Road Riders (FL) |
| SOR | Save Our Rivers (FL) |
| SOLPOST | Scar on Landscape Piece Of Shit Trail |
| SMS | Scenery Management System |
| SOPA | Schedule Of Proposed Actions |
| SAGBRAW | Schramm’s Annual Great Bicycle Ride Across Wisconsin |
| SAR | Search And Rescue |
| SW | Seasonal Water |
| STP | Seattle to Portland (bicycle event) |
| ST | Secondary Tread(s) |
| SCBA | Self-Contained Breathing Apparatus |
| SCUBA | Self-Contained Underwater Breathing Apparatus |
| SWT | Seminole Wekiva Trail (FL) |
| SOP | Sense of Place |
| SUDS | Senseless Ups and Downs (where a climb leads to no view) |
| STOP | Sensible Transportation Options for People (Portland, OR) |
| SNAG | Sensitive New Age Guy |
| SIA | Sentier International des Appalaches |
| SAAGBRAW | Sentinel’s Active Americans Great Bike Ride Across Wisconsin |
| SCORE | Service Corps Of Retired Executives |
| SHIFT | Shaping How we Invest For Tomorrow |
| SLM | Shared Land Marking |
| SUN | Shared-Use Nonmotorized |
| SUR | Shared Use Road |
| SRT | Shawangunk Ridge Trail (NY/NJ |
| SNP | Shenandoah National Park (VA) |
| SIS | Shimano Indexing System |
| SPD | Shimano Pedaling Dynamics (pedal system) |
| STI | Shimano Total Integration |
| SCT | Shingobee Connection Trail (MN) |
| SWB | Short Wheel Base (recumbent) |
| SH | Showers |
| SxS | Side by Side |
| SH | Side Hill (Trail) |
| SBTS | Sierra Buttes Trail Stewardship (CA) |
| SAMPLE | Signs & Symptoms, Allergies, Medications, Pertinent medical history, Last ins & outs, Events |
| STOP | Sit, Think, Observe, Plan |
| SNAFU | Situation Normal, All Fucked Up |
| SAS | Slow And Study |
| ST | Slow-twitch (fiber) |
| SC | Small Campsite |
| SORE | Small Off-Road Engine |
| SLHG | Smart Lady’s Hiking Group (WA) |
| SWEAT | Smokies Wilderness Elite Appalachian Trail Crew |
| SORP | Society of Outdoor Recreation Professionals |
| SOPWAMTOS | Society of People Who Actually Make Their Own Shit |
| SE | Soil Erosion |
| ST | Soil Type |
| SCRTA | Somerset County Rails to Trails Association (PA) |
| SDMB | Sonoran Desert Mountain Bicyclists (Tucson, AZ) |
| SMIDSY | Sorry Mate I Didn’t See You |
| SCAHPERD | South Carolina Alliance for Health, Physical Education, Recreation and Dance |
| SCPRT | South Carolina Department of Parks, Recreation and Tourism |
| SCRPA | South Carolina Recreation and Parks Association |
| SWAMP | South West Association for Mountain Bike Peddlers (FL) |
| SOBO | Southbound (thru-hiker) |
| SAM | Southeast Alabama Mountainbikers |
| SERR | Southeast Environment and Recreation Research |
| SEFTC | Southeastern Foot Trails Coalition |
| SAMBA | Southern Alabama Mountain Bicycling Association |
| SABA | Southern Appalachian Bicycling Association |
| SALT | Southern Appalachian Loop Trail |
| SAWS | Southern Appalachian Wilderness Stewards |
| SAMBA | Southern Arizona Mountain Bike Association |
| SCMA | Southern California Mountaineers Association |
| SHT | Southern Highlands Traverse |
| SMBS | Southern Mountain Bike Summit |
| SORBA | Southern Off-Road Bicycle Association |
| SUWA | Southern Utah Wilderness Alliance |
| SVMBA | Southern Virginia Mountain Bike Association |
| SWIMBA | Southwest Idaho Mountain Biking Association |
| SIDRA | Southwestern Idaho Desert Racing Association |
| SWINT | Southwestern Iowa Nature Trails |
| SAID | Specific Adaptations to Imposed Demands |
| SMART | Specific, Measurable, Attainable, Realistic, Trackable (goals) |
| SA | Special Agent |
| SLUP | Special Land Use Permit |
| SMA | Special Management Area |
| SRMA | Special Recreation Management Area |
| SRUP | Special Recreation Use Permit(s) |
| SUP | Special Use Permit |
| SSP | Special Status Plant |
| SSS | Special Status Species |
| SVIA | Specialty Vehicle Institute of America |
| SKI | Spending the Kids Inheritance |
| SAV | Sport Activity Vehicle |
| SUB | Sport Utility Bike |
| SUV | Sport Utility Vehicle |
| SRUP | Special Recreation Use Permit |
| SF | Square Foot (Feet) |
| SY | Square Yard(s) |
| SJR2C | St. Johns River-to-Sea Loop (FL) |
| SUP | Stand Up Paddle (board) |
| SMSA | Standard Metropolitan Statistical Area |
| SOP | Standard Operating Procedure |
| SD | State Director (BLM) |
| SHPO | State Historic Preservation Office(r) |
| SHC | State Horse Council |
| SIP | State Interim Plan |
| SLO | State Liaison Officer (for LWCF) |
| SOT | State of Trail (report) |
| SP | State Park |
| SRTAB | State Recreational Trail Advisory Board |
| STAM | State Trail Administrators Meeting |
| STAC | State Trails Advisory Committee |
| SOQ | Statement of Qualifications (contract) |
| SOW | Statement of Work |
| SCORP | Statewide Comprehensive Outdoor Recreation Plan |
| STIP | Statewide Transportation Improvement Program |
| STEP | Stewards for Trails, Education, and Partnerships (American Quarter Horse Association) |
| SWPPP | Stormwater Pollution Prevention Plan |
| SMZ | Streamside Management Zone |
| SAFE | Streets Are For Everyone |
| SWOT | Strengths, Weaknesses, Opportunities, and Threats analysis |
| S&S | Stretch & Safety |
| SNTD | Strive Not to Dive |
| SCA | Student Conservation Association |
| SHD | Student Hosteling Program (Bicycle Adventures) |
| SOH | Stupid Oughta Hurt |
| SME | Subject Matter Expert |
| SCORR | Summit County Off-Road Riders (CO) |
| SCT | Sun Corridor Trail (AZ) |
| SCTA | Sun Corridor Trail Association (AZ) |
| SPF | Sun Protection Factor |
| SX | Super Cross |
| SUL | Super Ultra Light |
| SHTA | Superior hiking Trail Association |
| SO | Supervisors Office (US Forest Service) |
| SAG | Support and Gear / Support and Grub / Support Aid Group |
| STB | Surface Transportation Board (US) |
| STPP | Surface Transportation Policy Project |
| STP | Surface Transportation Program |
| SOL | Survive Outdoors Longer |
| SMARTER Trails | Sustainable, Manageable, Artistic Recreational Trails that are Ecologically sound and have good Risk management strategy |
| STC | Sustainable Trails Coalition |
| SWECO | Sutter Welding and Equipment Company |
| SRT | Swamp Rabbit Trail (Greenville to Travelers Rest, SC) |
| SST | Sweet Smelling Toilet (US Forest Service) |
| SRT | Sweetwater River Trail (Rancho San Diego, CA) |
| SAK | Swiss Army Knife |
| SDM | System Diagram Map |
| TO | Table of Organization (BLM) |
| TRT | Tahoe Rim Trail (CA, NV) |
| TRTA | Tahoe Rim Trail Association (CA, NV) |
| TSS | Tailgate Safety Session |
| TMBA | Tallahassee Mountain Bike Association (FL) |
| TTF | Tallahassee Trail Festival (FL) |
| TRAI | Tandem Ride Across Iowa |
| TTF | Technical Trail Feature |
| TEHCC | Tennessee Eastman Hiking and Canoe Club |
| TTA | Tennessee Trails Association |
| TVA | Tennessee Valley Authority |
| TVB | Tennessee Valley Bike (Knoxville) |
| TBC | Texas Bicycle Coalition |
| TETRA | Texas Equestrian Trail Riders Association |
| TMTC | Texas Motorized Trails Coalition |
| TTAT | Texas Trails and Active Transportation (Conference) |
| TCF | The Conservation Fund |
| TNF | The North Face |
| TOBRAW | The Other Bike Ride Across Wisconsin |
| TOGIR | The Other Great Iowa Ride |
| TRANE | The Ride Around New England |
| TRIRI | The Ride In Rural Iowa |
| TTT | Things Take Time |
| TTD | Things To Do |
| TPI | Threads Per Inch |
| T&E | Threatened & Endangered species |
| TLA | Three Letter Acronym(s) |
| THR | Threshold Heart Range |
| TBD | Tick-Borne Disease(s) |
| T&A | Time & Attendance |
| TT | Time Trial |
| T-CLOC | Tires/Controls/Lights/Oil/Chassis |
| Ti | Titanium |
| TBA | To Be Announced |
| THT | Tobacco Heritage Trail (VA) |
| TNT | Today Not Tomorrow |
| TEAM | Together Everyone Achieves More |
| TEAMWORK | Together Everyone Achieves More With Organization Recognition and Knowledge |
| TRAL | Tonto Recreation Alliance (Tonto National Forest, AZ) |
| TMI | Too Much Information |
| TCB | Torrey C. Brown (Rail-Trail, MD) |
| TBSA | Total Body Surface Area |
| TEE | Total Energy Expenditure |
| TFR | Totally Fun Ride |
| TASC | Tour Across South Carolina |
| TDF | Tour de France (bicycle race) |
| TARTAR | Tour of the American River for Trikes and Recumbents |
| TOSRV | Tour of the Scioto River Valley (OH) |
| TOSRV | Tour of the Swan River Valley – West (MT) |
| TRIRI | Touring Ride in Rural Indiana |
| TOAD | Tourist on a Detour |
| T&R | Township and Range |
| TL | Track Length |
| TM | Trademark |
| TND | Traditional Neighborhood Developments |
| TCD | Traffic Control Device |
| TRL | Trail |
| TAI | Trail Access Information |
| TA | Trail Alignment |
| TAP | Trail Approval Process |
| TA | Trail Assessment |
| TRACS | Trail Assessment and Condition Surveys (US Forest Service) |
| TCC | Trail Care Crew (Subaru/IMBA program) |
| TCS | Trail Classification System (US Forest Service) |
| TCR | Trail Condition Reports |
| TCS | Trail Conservation Services (CO) |
| TEAS | Trail Emergency Access System |
| TFC | Trail Fixing Crew |
| TG | Trail Grade |
| TMA | Trail(s) Maintenance Assessment |
| TMO | Trail Management Objective (US Forest Service) |
| TMP | Trail Management Process |
| T-MAP | Trail Modeling and Assessment Platform (program of Rails-to-Trails Conservancy) |
| TOTA | Trail Of Tears Association |
| TOR | Trail Operations Report |
| TP | Trail Position |
| TRAILS | Trail Recreation and Adventure Institute for Leadership and Service (Rockingham Community College – Wentworth, NC) |
| TREAD | Trail Resources Database |
| TREC | Trail Riders Enthusiast Council (SC) |
| TROT | Trail Riders of Today (MD) |
| TRAILS | Trail Routing, Analysis, and Information Linkage System |
| TS | Trail Shelter |
| TS | Trail Solutions (IMBA) |
| TTNHT | Trail of Tears National Historic Trail |
| TTP | Trail Termination Point |
| TTEC | (A) Trail To Every Classroom |
| TT | Trail Town |
| TT | Trail Type |
| TURF | Trail Users Rights Foundation (IL) |
| TH | Trailhead |
| TKO | Trailkeepers of Oregon |
| TAB | Trails Advisory Board |
| TGAB | Trails and Greenway Advisory Board |
| TREC | Trails and Outdoor Recreation Summit |
| TOLA | Trails Of Legends Association (AL) |
| TRED | Trails for Recreation and Economic Development (Rome/Floyd counties, GA) |
| TRAC | Trails For Richmond Action Committee (CA) |
| THOR | Trails Have Our Respect |
| TMP | Trails Move People |
| TPA | Trails Preservation Alliance (CO) |
| TTT | Train The Trainer |
| TAT | Trans America Trail |
| TCT | Trans Canada Trail |
| TNGA | Trans North Georgia Adventure (Bicycle Event) |
| TAP | Transportation Alternatives Program |
| TE(s) | Transportation Enhancement(s) |
| TEAs | Transportation Enhancement Activities |
| TEA-21 | Transportation Equity Act for the 21st Century |
| TIP | Transportation Improvement Program |
| TIFIA | Transportation Infrastructure Financing and Investment Act |
| TIS | Transportation Inventory System |
| TIGER | Transportation Investment Generating Economic Recovery (Federal grant program) |
| TBI | Traumatic Brain Injury |
| TA | Travel Authorization |
| TV | Travel Voucher |
| TR | Travelers Rest (SC) |
| TL! | Tread Lightly! |
| TW | Tread Width |
| TPI | Treads Per Inch |
| TST | Treadmill Stress Test |
| TRAILS | TReasure State Academic Information & Library Services (MT) |
| TRTC | Triangle Rails-to-Trails Conservancy (NC) |
| TNT | Trinitrotoluene (high explosive) |
| TC | Triple Crown (Appalachian, Pacific Crest, and Continental Divide Trails) |
| TLT | Triple Lakes Trail (Denali National Park, AK |
| TLP | Trust for Public Land |
| TLR | Tubeless Ready |
| TORCA | Tucson Off-Road Cyclists & Activists Inc. |
| TIG | Tungsten Inert Gas (welding) |
| TOUCAN | TwO groUps CAN cross traffic signal |
| 2WD | Two-Wheel Drive Vehicle |
| UHMWPE | Ultra High Molecular Weight Polyethylene |
| UL | Ultra Light |
| UMCA | Ultra-Marathon Cycling Association |
| UPF | Ultraviolet Protection Factor |
| UV | Ultraviolet Ray(s) |
| USS | Under Seat Steering (recumbent) |
| UM | Undulating Meandering (trail) |
| USCS | Unified Soil Classification System |
| UFAS | Uniform Federal Accessibility Standards |
| UVC | Uniform Vehicle Code |
| UCI | Union Cycliste Internationale |
| UCTD | United Cycle Trades Directorate |
| UFWDA | United Four Wheel Drive Associations |
| US | United States |
| USADA | United States Anti-Doping Agency |
| USACE | United States Army Corp of Engineers (Department of Defense) |
| USBRS | United States Bicycle Route System |
| USBHOF | United States Bicycling Hall of Fame |
| USBP | United States Border Patrol |
| USCGS | United States Coast and Geodetic Survey |
| USC | United States Code (Federal statute) |
| USCOE | United States Corps of Army Engineers |
| USCF | United States Cycling Federation |
| USDA | United States Department of Agriculture |
| USDI | United States Department of the Interior |
| USDOT | United States Department of Transportation |
| USFWS | United States Fish and Wildlife Service |
| USFS | United States Forest Service (US Department of Agriculture) |
| USGS | United States Geological Survey |
| USNG | United States National Grid |
| USPS | United States Postal Service |
| USPRO | United States Professional Racing Organization |
| USAC | United States of America Cycling, Inc. |
| UCP | Universal Chrome Plating |
| UDS | Universal Distress Signal |
| URL | Universal Resource Locator (for internet addresses) |
| UST | Universal System Tubeless (for bicycle tubeless tire/rim systems) |
| UTAP | Universal Trail Assessment Process (mapping project) |
| UTM | Universal Transverse Mercator |
| UTRA | Upstate Trail Riders Association |
| UBDC | Urban Bikeway Design Competition |
| UPI | Urban Pathways Initiative (program of Rails-to-Trails Conservancy) |
| UCT | User Created Trail(s) |
| UE | User Experience |
| UX | User Experience |
| UMBA | Utah Mountain Bike Association |
| UTV | Utility Trail (Terrain) Vehicle |
| VB | Vapor Barrier |
| VBL | Vapor Barrier Liner |
| VC | Vehicular Cycling |
| VTT | Velo Tout-Terrain (French for mountain biking) |
| V² | Velocity/Volume |
| VT | Ventilatory Threshold |
| VLT | Vermont Long Trail |
| VMBT | Vermont Mountain Bike Association |
| VIP | Veterans In Parks |
| VBF | Virginia Bicycling Federation |
| VCT | Virginia Capital Trail (Jamestown to Richmond) |
| VCTF | Virginia Capital Trail Foundation |
| VMBT | Virginia Mountain Bike Trail |
| VERP | Visitor Experience and Resource Protection |
| VIM | Visitor Impact Management |
| VUD | Visitor Use Day |
| VMS | Visual Management System |
| VQO | Visual Quality Objective |
| VRM | Visual Resource Management |
| VS | Voluntary Simplicity |
| VTF | Volunteer Time Off |
| VWP | Volunteer Work Party |
| VISTA | Volunteers in Service to America |
| VIF | Volunteers in the Forest (US Forest Service) |
| VIP | Volunteers in the Parks (National Park Service) |
| VRU | Vulnerable Road User (law) |
| WG | Wage Grade |
| WALC | Walkable and Livable Communities |
| W&OD | Washington & Old Dominion Railroad Regional Park (VA) |
| WABA | Washington Area Bicyclist Association (DC) |
| WOHVA | Washington Off Highway Vehicle |
| WO | Washington Office (US Forest Service, BLM) |
| WSBA | Washington State Bicycling Association |
| WTA | Washington Trails Association |
| WAG | Waste Alleviation and Gelling bag (for human waste) |
| WMD | Water Management District |
| WOPO | Water Off, People On |
| WPB | Waterproof-Breathable |
| Wh | Watt Hours |
| WITT | We’re In This Together |
| WAY | Week-A-Year |
| WAMBA | West Alabama Mountain Biking Association |
| WAG | West Ashley Greenway (Charleston, SC) |
| WMTG | West Michigan Trails & Greenways (Coalition) |
| WOT | West Orange Trail (FL) |
| WVMBA | West Virginia Mountain Bike Association |
| WVRTC | West Virginia Rails to Trail Council |
| WCCC | Western Colorado Conservation Corps |
| WYTC | Westmoreland Yough Trail Chapter (PA) |
| WIIFM | What’s In It For Me |
| WBV | Whole Body Vibration (training) |
| WOL | Wide Outside Lane |
| WSR | Wild and Scenic River |
| WAG | Wild Ass Guess |
| WEW | Wild East Women |
| WA | Wilderness Area |
| WCC | Wilderness Conservation Corps |
| WEA | Wilderness Education Association |
| WFA | Wilderness First Aid |
| WFR | Wilderness First Responder |
| WMA | Wilderness Medical Associate(s) |
| WMI | Wilderness Medicine Institute |
| WROS | Wilderness Recreation Opportunity Spectrum |
| WSA | Wilderness Study Area |
| WTB | Wilderness Trail Bikes (bike component company) |
| WUI | Wildland-Urban Interface |
| WMA | Wildlife Management Area |
| WRS-DRT | William R. Steinhaus – Dutchess Rail-Trail (NY) |
| WTP | Willingness To Pay |
| WECS | Wimpy Extension Cord Syndrome |
| WATVA | Wisconsin ATV Association |
| WOHVA | Wisconsin Off-Highway Vehicle Association |
| WORBA | Wisconsin Off-Road Bicycling Association |
| WOW | Women On Wheels |
| WTF Bikexplorers | Women/Trans/Femme Bikexplorers |
| WOMBATS | Women’s Mountain Bike And Tea Society |
| WM | Work Month |
| WCF | Working Capital Fund |
| WLL | Working Load Limit |
| WADA | World Anti-Doping Agency |
| WBR | World Bicycle Relief |
| WGS 84 | World Geodetic System 1984 |
| WIOC | World Is Our Classroom, Inc. |
| WTN | World Trails Network |
| YTD | Year-to-Date |
| YJA | Yellow Jacket of Authority |
| YIMBY | Yes, In My Back Yard |
| YAS | Yoga and Spinning |
| YCRTA | York County Rail Trail Authority (PA) |
| YODO | You Only Die Once |
| YRTC | Yough River Trail Council (PA) |
| YMMV | Your Mileage May Vary |
| YOYO | You’re On Your Own |
| YACC | Young Adult Conservation Corps |
| YMCA | Young Men’s Christian Association |
| YPP | Young People for Parks (WV) |
| YMMV | Your Mileage May Vary |
| YOYO | You’re On Your Own |
| YCC | Youth Conservation Corps |
| YEP | Youth Employment in Parks |
1,818 Acronyms and Abbreviations
Jim's Trail Resources 