| Abbreviation | Definition |
|---|---|
| CTP | Certified Transportation Professional |
| CTP | Comprehensive Transportation Plan |
| CTP | Consolidated Transportation Program |
| CTP | County Transportation Program |
| C-TPAT | Customs - Trade Partnership Against Terrorism |
| CTPL | Comprehensive Transportation Project List |
| CTPP | Census Transportation Planning Package |
| CTR | Center for Transportation Research |
| CTR | Civil Tilt Rotor |
| CTR | Commuter Trip Reduction |
| CTR | Control Zone |
| CTR | Crash Test Report |
| CTRAC | Common Terminal Radar Approach Control |
| CTRB | CTAS Technical Review Board |
| CTRI | Center for Transportation Research and Implementation |
| CTRIS | Canadian Transportation Research Information Service |
| CTRL | Channel Tunnel Rail Link |
| CTS | Cadillac Touring Sedan |
| CTS | Cadillac Touring Sport |
| CTS | Catera Touring Sedan |