| Acronym | Explanation and Links |
| ADA | Americans with Disabilities Act |
| AADT | Annual Average Daily traffic |
| AVL | Automatic Vehicle Locator |
| CAA | Clean Air Act (link to EPA's "Plain English Guide") |
| CAAA | Clean Air Act Amendments of 1990 |
| CBD | Central Business District |
| CMAQ | Congestion Mitigation and Air Quality funds |
| CMS | Congestion Management System |
| CNST | Construction (phase of a project) |
| NYSDOT | New York State Department of transportation |
| E+C | Existing plus committed network (used in modeling) |
| EA | Environmental Assessment |
| EIS | Environmental Impact Statement |
| ENG | Engineering (phase of a project) |
| EPA | Environmental Protection Agency |
| FAA | Federal Aviation Administration |
| FAU | Federal-Aid Urban |
| FHWA | Federal Highway Administration |
| FRA | Federal Railroad Administration |
| FTA | Federal transit Administration |
| FY | Fiscal Year (Federal, runs from October to September) |
| GIS | Geographic Information Systems |
| HOV | High Occupancy Vehicle |
| HPMS | Highway Performance Monitoring System |
| IM | Interstate Maintenance funds |
| ISTEA | Intermodal Surface transportation Efficiency Act of 1991 |
| ITS | Intelligent transportation Systems |
| IVHS | Intelligent Vehicle and Highway Systems (former term for ITS) |
| LOS | Level of Service -- performance measure |
|
LRTP |
Long Range transportation Plan |
|
MAP-21 |
Moving Ahead for Progress in the 21st Century |
| MPO | Metropolitan Planning Organization |
| MTA | Metro Transit Authority |
| NEPA | National Environmental Policy Act |
| NHS | National Highway System funds |
| PE | Preliminary Engineering (phase of a project) |
| ROW | Right-of-Way (phase of a project) |
| SR | State Route |
| STA | State gas tax funds |
| STP | Surface Transportation Program funds |
| TAZ | Traffic Analysis Zone (used in modeling) |
| tdM | Transportation Demand Management (also called Transportation Control Measures, or TCMs) |
| TEA-21 | The Transportation Equity Act for the 21st Century |
| TIP | Transportation Improvement Program |
| TMA | Transportation Management Area |
| TSM | Transportation System Management |
| UPWP | Unified Planning Work Program |
| US DOT | United States Department of Transportation |
| V/C | Volume to Capacity ratio -- measures roadway congestion |
| VMT | Vehicle Miles traveled |
| VOC | Volatile Organic Compounds (air pollutants) |
