| AASHTO |
American Association of State Highway and Transportation Officials |
| APC |
AVL particle counter |
| APTA |
American Public Transit Association |
| AVL |
automated vehicle locator |
| Caltrans |
California Department of Transportation |
| DVRPC |
Delaware Valley Regional Planning Commission |
| FHWA |
Federal Highway Administration |
| GPS |
Global Positioning System |
| GTFS |
General Transit Feed Specification |
| ISTEA |
Intermodal Surface Transportation Act |
| LBS |
location-based services |
| LOS |
level of service |
| MAP-21 |
Moving Ahead for Progress in the 21st Century |
| MSP |
multimodal system productivity |
| NCTD |
North County Transit District |
| OD |
origin-destination |
| PHT |
person hours traveled |
| PMT |
person mile traveled |
| SANDAG |
San Diego Association of Governments |
| TRB |
Transportation Research Board |
| VMT |
vehicle miles traveled |
| WMATA |
Washington Metropolitan Area Transit Authority |
