| Acronym |
Definition |
| T&E | Threatened and Endangered (Species) |
| T2 | Technology Transfer |
| TA | Technical Advisory |
| TAR | Transportation Acquisition Regulation |
| TDOT | Tennessee Department of Transportation |
| TEA-21 | Transportation Equity Act for the 21st Century |
| THPO | Tribal Historic Preservation Officer |
| TIFIA | Transportation Infrastructure Finance and Innovation Act |
| TIP | Transportation Improvement Plan |
| TQM | Total Quality Management |
| TRB | Transportation Research Board |
| TTAP | Tribal Technical Assistance Plan |
| TxDOT | Texas Department of Transportation |
