Transportation in metropolitan Detroit is provided by a system of transit services, airports, and an advanced network of freeways which interconnect the city of Detroit and the Detroit region. The Michigan Department of Transportation (MDOT) administers the region's network of major roads and freeways. The region offers mass transit with bus services provided jointly by the Detroit Department of Transportation (DDOT) and the Suburban Mobility Authority for Regional Transportation (SMART) through a cooperative service and fare agreement administered by the Regional Transit Authority (RTA). Cross border service between the downtown areas of Windsor and Detroit is provided by Transit Windsor via the Tunnel Bus. A monorail system, known as the People Mover, operates daily through a 2.94 mile (