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Tennessee’s Transportation System

Highway System

  • Bridges: 19,740, including 8,291 state owned bridges, 11,449 locally owned bridges
  • Interstate miles: 1,104  
  • 18 interstate rest areas
  • 14 interstate welcome centers
  • 10 truck weigh stations
  • State maintained highway miles: 13,884
  • Total highway miles: 95,523

Airport System

  • 74 General Aviation
  • 5 commercial
  • 142 heliports

Rail System

  • 18 short line railroads on 842 miles of rail
  • 6 major rail lines on 2,177 miles of rail

Transit System

  • 28 transit systems serving all 95 counties: four large urban systems, eight small urban systems, 10 rural systems, one regional commuter transit system in Middle Tennessee, and local transit in five towns.


  • 1,062 miles of main channel miles of navigable waterways

Bicycle/Pedestrian System

  • 4,500 highway miles with 4-foot shoulders to accommodate bicycles
  • 103 miles of state routes with designated bike lanes
  • 270 miles of greenways, sidewalks and trails
  • 172 miles of designated U.S. Bicycle Routes


  • On each gallon of gas, Tennessee motorists pay 21.4 cents of state gas tax and 18.4 cents of federal gas tax. Funds are dedicated for the Tennessee transportation system. (Budget)

Key Programs

  • TDOT SmartWay is the state's intelligent transportation system deployed in all four urban areas. The full complement includes a system of 470 cameras, 151 dynamic message signs and four transportation management centers to monitor traffic and assist in reducing congestion on urban interstates. Completed systems are located in Nashville, Knoxville and Memphis and in Chattanooga.

  • A rural TDOT SmartWay system is located in seven rural counties in east Tennessee and includes cameras to monitor the Rockwood Mountain section of I-40 in Roane County.

  • The TDOT HELP program was launched in 1999 to help clear interstates of congestion by removing obstacles including vehicles from the travel lanes, thereby reducing traffic impacts. Since that time, thousands of motorists have been assisted and impacts to traffic have been reduced.

  • TDOT has motorist information programs, some of which use new communication tools such as Twitter, Facebook and Tennessee 511 which aid motorists with highway information.

  • Several TDOT programs promote good driving behaviors through numerous public awareness efforts including Click It or Ticket.

  • Keeping our roads beautiful is important. These programs promote keeping our highways beautiful: StopLitter, Adopt-A-Highway, Tennessee Groves and Tennessee Roadscapes.