| Abbreviation | Definition |
|---|---|
| CTC | Community Transportation Coordinator |
| CTC | Computed Torque Control |
| CTCI | Concrete Transportation Construction Inspector |
| CTCL | Colchester Transportation Cooperative Limited |
| CTCO | Chicago Transportation Coordination Office |
| CTCP | Communication and Transport Control Programme |
| CTD | Commission for the Transportation Disadvantaged |
| CTD | Controlled Time of Departure |
| CTD | Crash Test Dummy |
| CTDF | Concerned Taxi Drivers Foundation |
| CTE | Center for Transportation and the Environment |
| CTEA | Canadian Transportation Equipment Association |
| CTED | Center for Transportation Education and Development |
| CTF | California Transportation Foundation |
| CTFA | California Transportation Financing Authority |
| CTFCA | Canadian Transportation Fuel Cell Alliance |
| CTG | Corporate Transportation Group |
| CTI | Chemical Transportation Inc |
| CTIP | California Transportation Infrastructure Priorities |
| CTIP | Coordinated Federal Lands Highways Technical Information Program |