| Abbreviation | Definition |
|---|---|
| BTA | Bicycle Transportation Account |
| BTA | Bicycle Transportation Alliance |
| BTC | Bridge and Tunnel Crowd |
| BTD | Boston Transportation Department |
| BTEG | Bicycle Transportation Engineering Group |
| BTF | Belgian Taxi Flight |
| BTFC | Boston Taxi Football Club |
| BTNA | Bombardier Transportation North America |
| BTR | Bridging Transportation Researchers |
| BTS | Bangkok Transport System |
| BTS | Beware Transportation Schedules |
| BTTS | Brooke Transportation Training Solutions |
| BTV | Blast Test Vehicle |
| BTW | Behind The Wheel |
| BUEC | Backup Emergency Communications |
| BUF | Greater Buffalo International Airport |
| BUGV | Ballistic Unmanned Ground Vehicle |
| BUIA | British United Island Airways |
| BUILT | Broadening Urban Investment to Leverage Transportation |
| BULKTAINER | Bulk Container |