| Abbreviation | Definition |
|---|---|
| TCU | Transportation Control Unit |
| TCV | Treasury Commercial Vehicles |
| TD | Tanker - Dirty |
| TD | Test Drive |
| TD | Traffic Data |
| TD | Transport Department |
| TD | Transportation Disadvantaged |
| TD | Turbo Diesel |
| TDA | Train Dynamics Analyzer |
| TDA | Transportation Development Association |
| TDA | Transportation Disaster Assistance |
| TDAC | Transportation DBE Advisory Committee |
| TDC | Transportation Department Chair |
| TDC | Twin Dual Cam |
| TDC | U. S. Travel Data Center |
| TDCC | Transportation Data Coordinating Committee |
| TDD | Transportation Development Districts |
| TDD | Truck Driver Department |
| TDDS | Talking Directory Display System |
| TDG | Transportation Of Dangerous Goods |