The Texas Department of Transportation (TxDOT , pronounce "tex-dot") is a governmental agency in the U.S. state of Texas. Its stated mission is to "work cooperatively to provide safe, effective and efficient movement of people and goods" throughout the state. Though the public face of the agency is generally associated with the construction and maintenance of the state's immense highway system (every mile of which is paved), the agency is also responsible for overseeing aviation, rail, and public transportation systems in the state.