Acronyms
 TA: Tailgating Advisory, Threat Arbitration
 TAS: Toll Administration Subsystem (legacy National ITS Architecture)
 TBD: To Be Determined
 TC: Target Classification
 TC: Technical Committee
 TCDs: Traffic Control Devices
 TCIP: Transit Communications Interface Profiles
 T-CONNECT: Transit Connection Protection
 TCP: Transport Control Protocol
 TCP/IP: Transport Control Protocol / Internet Protocol
 TCS: Toll Collection Subsystem (legacy National ITS Architecture)
 TD: Transportation Disadvantaged
 T-DISP: Transit Dispatch
 TDM: Travel Demand Management
 TEA: Transportation Equity Act
 TEA-21: Transportation Equity Act for the 21st Century
 TIA: Telecommunications Industry Association
 TIC: Transportation Information Center
 TIP: Transportation Improvement Program
 TLS: Transport Layer Security
 TM: Traffic Management
 TMA: Transportation Management Area
 TMC: Traffic Management Center
 TMDD: Traffic Management Data Dictionary
 TMS: Traffic Management Subsystem (legacy National ITS Architecture)
 TNC: Transportation Network Company
 TOC: Traffic Operations Center
 TOIP: Traffic Operations Infrastructure Plan
 TPA: Transportation Planning Authority
 TRB: Transportation Research Board
 TRMC: Transit Management Center
 TRMS: Transit Management Subsystem (legacy National ITS Architecture)
 TRV: Transit Vehicle
 TRVS: Transit Vehicle Subsystem (legacy National ITS Architecture)
 TS: Time Synchronization
 TSA: Transportation Security Administration
 TSE: Traveler Support Equipment
 TSMO: Transportation Systems Management and Operations
 TSP: Transit Signal Priority
 TSR: Transit Stop Request
 TTI: Texas A&M Transportation Institute
 TVCW: Transit Vehicle Crash Warning
 TVSSW: Transit Vehicle at Station/Stop Warnings