The core agency mission of TDOT is to provide a safe and reliable transportation system for people, goods, and services that supports economic prosperity in Tennessee.

The major duties and responsibilities of TDOT are to: Prior to 1915, the state had no central authority governing construction and maintenance of roads.

The governor, legislature, other road associations, and local governments all attempted to serve these tasks, leading to a lack of planning and management.

The collapse of the banking system in 1930 resulted in significant losses for the state and led to an inability to fund the department.

Diversion of federal funds and military enlistment of personnel during World War II again crippled the department.

The leadership level also includes the Deputy Commissioner, and leaders for legal, aeronautics, community relations, and legislation.

Most administrative offices operate from the TDOT headquarters in downtown Nashville, the state's capital city.

Those state funds come from a combination of dollars collected from gas and diesel tax revenues, titling and registration fees.