Missouri Department of Transportation, established in 1979, is headquartered in Jefferson City, with offices in St. Joseph, Macon, Hannibal, Kansas City, St. Louis, Joplin, Springfield, Willow Springs, and Sikeston, Mo. The department works with the public, transportation partners, state and federal legislators, and other state and local agencies to provide a safe and efficient transportation system to the people of Missouri. MoDOT has responsibilities for various transportation alternatives, such as highways, aviation, waterways, transit and railroads. The responsibilities include the total operation of the more than 30,000-mile highway system, including highway location, design, construction and maintenance. In addition, the department cooperates and coordinates with owners and operators of other modal systems in the development and improvement of airports, rail facilities, ports and the operational cost of transit systems. MoDOT's principal sources of state revenue are motor vehicle fuel taxes, licenses and fees, and motor vehicle sales tax.