| AAM | Advanced Air Mobility |
| ACDM | Airport Collaborative Decision-Making |
| ADAAG | Americans with Disabilities Act Accessibility Guidelines |
| ADAS | Advanced Driver Assistance Systems |
| ADRM | Airport Development Reference Manual (IATA) |
| ADS | Automated Driving Systems |
| AEP | Airport Emergency Plan |
| AGT | Automated Guideway Transit |
| AIP | Airport Improvement Program |
| ALP | Airport Layout Plan |
| ANSI | American National Standards Institute |
| APM | Automated People Mover |
| APOC | Airport Operations Center |
| AREMA | American Railway Engineering and Maintenance-of-Way Association |
| ATC | Automatic Train Control |
| ATP | Automatic Train Protection |
| AV | Automated Vehicle |
| BART | Bay Area Rapid Transit |
| BEV | Battery-Electric Vehicle |
| BIL | Bipartisan Infrastructure Law |
| BRT | Bus Rapid Transit |
| CAHSR | California High-Speed Rail |
| CAT | City Airport Train |
| CatEx | Categorical Exclusion |
| CAV | Connected and Automated Vehicle |
| CD | Controlling Distance |
| CFR | Code of Federal Regulations |
| CIG | Capital Investment Grants |
| CMAQ | Congestion Mitigation and Air Quality |
| CONRAC | Consolidated Rental Car |
| CRS | Congressional Research Service |
| CTA | Central Terminal Area |
| CVC | California Vehicle Code |
| DDT | Dynamic Driving Task |
| DOT | Department of Transportation |
| DSRC | Dedicated Short-Range Communications |
| EA | Environmental Assessment |
| EIS | Environmental Impact Statement |
| EMS | Environmental Management System |
| EnMS | Energy Management System |
| EV | Electric Vehicle |
| EVSP | Electric Vehicle–Charging Service Provider |
| eVTOL | Electric Vertical Takeoff and Landing |
| FATO | Final Approach and Takeoff Area |
| FCC | Federal Communications Commission |
| FCEV | Fuel Cell–Electric Vehicle |
| FLM | First and Last Miles |
| GEV | Ground-Effect Vehicle |
| GHG | Greenhouse Gas |
| GIS | Geographic Information Systems |
| GNSS | Global Navigation Satellite System |
| GOL | Gol Linhas Aéreas Inteligentes |
| GRT | Group Rapid Transit |
| GTC | Ground Transportation Center |
| HAV | Highly Automated Vehicle |
| HCM7 | Highway Capacity Manual, 7th Edition |
| HCWS | Highway Crossing Warning System |
| HDV | Human-Driven Vehicle |
| HEV | Hybrid-Electric Vehicle |
| HSIPR | High-Speed Intercity Passenger Rail |
| IATA | International Air Transport Association |
| ICE | Internal Combustion Engine |
| IOO | Infrastructure Owner-Operator |
| ISO | International Organization for Standardization |
| ITS | Intelligent Transportation System |
| LDP | Lane Departure Prevention |
| LED | Light-Emitting Diode |
| LEED | Leadership in Energy and Environmental Design |
| lidar | Light Detection and Ranging |
| LOS | Level of Service |
| LRT | Light Rail Transit |
| LSAV | Low-Speed Automated Vehicle |
| MaaS | Mobility-as-a-Service |
| MARC | Maryland Area Regional Commuter |
| MARTA | Metropolitan Atlanta Rapid Transit Authority |
| MAX | Metropolitan Area Express |
| MDG | Monocable Detachable Gondola |
| MOE | Measure of Effectiveness |
| mph | Miles per Hour |
| MPO | Metropolitan Planning Organization |
| MRT | Mass Rapid Transit |
| MTA | Metropolitan Transportation Authority |
| MUTCD | Manual on Uniform Traffic Control Devices |
| NABSA | North American Bikeshare & Scootershare Association |
| NACTO | National Association of City Transportation Officials |
| NCUTCD | National Committee on Uniform Traffic Control Devices |
| NEPA | National Environmental Policy Act |
| O&M | Operating and Maintenance |
| OATS | Operating Above the Standard |
| ODD | Object Design Domain |
| OEDR | Object and Event Detection and Response |
| OHSMS | Occupational Health and Safety Management System |
| p/h/d | Passengers per Hour per Direction |
| PBL | Protected Bike Lane |
| PED | Portable Electronic Device |
| PFC | Passenger Facility Charge |
| PHEV | Plug-in Hybrid-Electric Vehicle |
| PM | Particulate Matter |
| POC | People of Color |
| PRM | Passengers with Reduced Mobility |
| PRT | Personal Rapid Transit |
| PTC | Positive Train Control |
| QMS | Quality Management System |
| QTA | Quick Turnaround Area |
| RAISE | Rebuilding American Infrastructure with Sustainability and Equity |
| RAM | Regional Air Mobility |
| RD | Rotor Diameter |
| RPA | Regional Plan Association |
| RSU | Roadside Unit |
| SBB | Swiss Federal Railways (Schweizerische Bundesbahnen) |
| SEL | Sound Exposure Level |
| SeMS | Security Management System |
| SEPTA | Southeastern Pennsylvania Transportation Authority |
| SNCF | Société Nationale des Chemins de fer Français |
| SOP | Standard Operating Procedure |
| STB | Surface Transportation Board |
| STBG | Surface Transportation Block Grant |
| STEP | Safe Transportation for Every Pedestrian |
| STOL | Short Takeoff and Landing |
| SUV | Sport Utility Vehicle |
| TIFIA | Transportation Infrastructure Finance and Innovation Act |
| TLOF | Touchdown and Liftoff Area |
| TNC | Transportation Network Company |
| UAM | Urban Air Mobility |
| U.S.C. | U.S. Code |
| V2I | Vehicle-to-Infrastructure |
| V2V | Vehicle-to-Vehicle |
| VALE | Voluntary Airport Low Emissions |
| VTA | Valley Transportation Authority |
| VTOL | Vertical Takeoff and Landing |
| WDW | Walt Disney World |
| WMATA | Washington Metropolitan Area Transit Authority |
| WVU | West Virginia University |
| ZEV | Zero-Emissions Vehicle |