The Suburban Mobility Authority for Regional Transportation (SMART) is the public transit operator serving the suburbs of Detroit, Michigan, United States. Beginning operations in 1967 as the Southeastern Michigan Transportation Authority (SEMTA), the agency was reorganized and renamed SMART in 1989. SMART operates 44 bus routes, plus paratransit and microtransit services.

Metro Detroit is a major metropolitan area in the U.S. state of Michigan, consisting of the city of Detroit and over 200 municipalities in the surrounding area with its largest employer being Oakland County. There are varied definitions of the area, including the official statistical areas designated by the Office of Management and Budget, a federal agency of the United States.