| Abbreviation | Definition |
|---|---|
| NTPEP | National Transportation Product Evaluation Program |
| NTR | Non Transportation Related |
| NTRC | National Transportation Research Center |
| NTS | National Traffic System |
| NTS | National Transportation Statistics |
| NTS | National Transportation System |
| NTS | Neighborhood Transportation Service |
| NTS | New Truck Seat |
| NTSF | National Transportation Stakeholders Forum |
| NTSR | National Transportation Statistics Report |
| NTTC | National Tribal Transportation Conference |
| NTTS | Northeast Tarrant Transportation Summit |
| NTVA | Nepal Tourist Vehicle Association |
| NTVC | National Transportation Vetting Center |
| NTVS | Non Tactical Vehicle System |
| NTWA | National Taxi Workers Alliance |
| NUAC | Nordic Unified Air Traffic Control |
| NUAI | Northern Utah Airspace Initiative |
| NUC | Not Under Command |
| NUS | No U-Turn Sign |