| AI | Artificial Intelligence |
| ALCRM | All-Level Crossing Risk Model |
| API | Application programming interfaces |
| CATS | Charlotte Area Transit System |
| CCTV | Closed-Circuit Television |
| CMAQ | Congestion Mitigation and Air Quality |
| COG | Council of Government |
| CRISI | Consolidated Rail Infrastructure and Safety Improvement |
| DART | Dallas Area Rapid Transit |
| DHS | Department of Homeland Security |
| FHWA | Federal Highway Administration |
| FRA | Federal Railroad Administration |
| FTA | Federal Transit Administration |
| GPS | Global positioning system |
| ICC | Illinois Commerce Commission |
| IGCT | Intelligent Grade Crossing and Trespassing Tool |
| LACMTA | Los Angeles County Metropolitan Transportation Authority |
| LIDAR | Light Detection and Ranging |
| LIRR | Long Island Rail Road |
| LRT | Light rail transit |
| MCB-CCTV | Manually Controlled Barrier CCTV |
| MCB-OD | Manually Controlled Barrier Obstacle Detection |
| MNCR | Metro North Commuter Railroad |
| MUTCD | Manual on Uniform Traffic Control Devices for Streets and Highways |
| MPO | Metropolitan Planning Organization |
| MTA | Metropolitan Transport Authority |
| MTU | Michigan Technological University |
| NCUTCD | National Committee on Uniform Traffic Control Devices |
| NEMA | National Electrical Manufacturers Association |
| NR | Network Rail |
| NRC | Network Rail Consulting |
| NTD | National Transit Database |
| OD | Obstacle detection |
| PTASP | Public Transportation Agency Safety Plan |
| PTC | Positive train control |
| PTZ | Pan-Tilt-Zoom |
| RCEP | Rail Crossing Elimination Program |
| RSSB | Rail Safety and Standards Board |
| SEPTA | Southeastern Pennsylvania Transportation Authority |
| SMART | Strengthening Mobility and Resiliency in the Transportation System |
| SS4A | Safe Streets for All |
| TMC | Traffic Management Center |
| TriMet | Tri-County Metropolitan Transportation District of Oregon |
| TSA | Transportation Security Administration |
| UTA | Utah Transit Authority |
| VMS | Video Maintenance System |
| VRM | Vehicle revenue miles |