The Suburban Mobility Authority for Regional Transportation (SMART) is the public transit operator serving the suburbs of Detroit, Michigan, United States. It supplements the Detroit Department of Transportation, which operates buses within the city of Detroit. Beginning operations in 1967 as the Southeastern Michigan Transportation Authority (SEMTA), the agency was reorganized and renamed SMART in 1989. SMART operates 47 bus routes, plus paratransit and microtransit services, covering select communities in Wayne and Oakland counties, plus all of Macomb County.