The Suburban Mobility Authority for Regional Transportation (SMART) is the public transit company providing fixed-route, Connector and Community Transit services throughout the tri-county area in suburban Detroit. The agency was formed in 1967 as the Southeastern Michigan Transportation Authority (SEMTA), following guidelines set by Public Act 204 enacted that year which replaced Downriver's two largest transit providers, Great Lakes Transit and Metropolitan Transit. It received the current SMART name in 1989.
SMART currently has a fleet of over 230 fixed-route buses which serve dozens of routes, including many in the Downriver area listed below.
- SMART Route 125 is the Fort Street bus, which turns west out Eureka Road to Metro Airport and down Outer Drive and West Jefferson Avenue to serve Ecorse and River Rouge. On weekdays continuing into Detroit.
- SMART Route 140 is the Southshore bus, which begins in Downtown Wyandotte and heads out through Fairlane Green to the Amtrak station.
- SMART Route 160 is the Downriver bus, running from Southland Center along a number of roads to West Road and Grange Road.
- SMART Fast Michigan, or Route 261, is the BRT version of the Michigan Avenue local-stops bus (Route 200), running from Detroit to Merriman Road, where it turns south to serve Metro Airport.
- SMART Route 275 is the Telegraph Road bus, running from Southland Center north all the way to Pontiac.
- SMART Route 280 is the Middlebelt Road bus, running from Metro Airport to Garden City.
- SMART Route 830 is the park and ride bus from West Road and Grange Road to Detroit.