| Abbreviation | Definition |
|---|---|
| BPA | ByPass Air |
| BPPC | Bicycle and Pedestrian Partnership Council |
| BPV | By Pass Valve |
| BQE | Brooklyn-Queens Expressway |
| BQP | Bus Quality Partnership |
| BR | Beach Road |
| BR | Big Rod |
| BR | Braced and Racked |
| BRAC | Brotherhood of Railway and Airline Clerks |
| BRCE | Barrie Rail Corridor Expansion |
| BREL | British Rail Engineering Limited |
| BRITE | Bright Radar Indicator Tower Equipment |
| BRL | Building Restriction Line |
| BRP | Blue Ridge Parkway |
| BRS | Brooklands Road Special |
| BRT | Bus Rapid Transit |
| BRTB | Baltimore Regional Transportation Board |
| BRV | Bold Runabout Vehicle |
| BRV | Bullet Resistant Vehicle |
| BRV | Bullet Resistant Vehicles |