| Abbreviation | Definition |
|---|---|
| STCC | Standard Transportation Commodity Classification |
| STCC | Standard Transportation Commodity Code |
| STCD | Southern Transportation Centre of Development |
| STCD | Sustainable Transportation and Communities Division |
| STCH | Sustainable Transportation Coalition of Hawaii |
| STD | Severe Tire Damage |
| STDP | Southern Transport Development Project |
| STED | Surface Transportation Enforcement Division |
| STEP | Safe Transportation for Every Pedestrian |
| STEP | Service Test and Evaluation Program |
| STF | Scheduled Transfer Facility |
| STFT | Short Term Firm Transportation |
| STGO | Special Transport Group Order |
| STI | Specialized Transportation Inc |
| STI | Strategic Transportation Investments |
| STI | Sustainable Transport Initiative |
| STIC | State Transportation Innovation Councils |
| STIP | State Transportation Improvement Plan |
| STIP | State Transportation Improvement Program |
| STIP | Statewide Transportation Improvements Program |