 DDOT partners with the Suburban Mobility Authority for Regional Transportation (SMART).As the largest public transit agency in the state of Michigan, DDOT primarily serves the city of Detroit, with some additional and limited service to nearby cities of Dearborn, Hamtramck, Highland Park (both are Detroit enclaves), Harper Woods, Livonia, Redford Township, River Rouge and Southfield.DDOT has a fare and ride agreement with the Suburban Mobility Authority for Regional Transportation as it supplements the city with bus service linking the city to the rest of Metro Detroit and Detroit Metropolitan Wayne County Airport.