Established in 1976, the Minnesota Department of Transportation develops and implements policies, plans and programs for highways, railroads, commercial waterways, aeronautics, public transit and motor carriers. It operates an office of maintenance that retains and preserves highways in Minnesota. The department coordinates state aid initiatives for the local transportation division that provides technical assistance in highway and bridge design, construction and maintenance. This division authorizes grants for bridge construction, coordinates local federally funded projects and provides the overall management of the state aid system. The Minnesota Department of Transportation additionally operates a metro division that specializes in the design, operation and inspection of traffic control signal systems in the metropolitan area. The department maintains a location in Windom, Minn.