| Abbreviation | Definition |
|---|---|
| ST | Sports Tourer |
| ST | Sports Touring |
| ST | Stadium Truck |
| ST | Standard Touring |
| ST | Standard Trailer |
| ST | Station Timed |
| ST | Street |
| ST | Street Thunder |
| STA | Scheduled Time of Arrival |
| STA | Solano Transportation Authority |
| STA | Special Transportation Area |
| STA | Strategic Transportation Analysis |
| STAA | Surface Transportation Assistance Act |
| STAA | Surface Transportation Authorization Act |
| STAC | Stacspecial Transportation Advisory Committee |
| STAC | Standard Traffic Agents Code |
| STAC | Statewide Transportation Advisory Committee |
| STAD | Standardized Transportation Aging and Disposal |
| STAK | Student Transportation Association of Kentucky |
| STAR | Simplified and Transparent Administration of Registration |