 M @-@ 3 is a north – south state trunkline highway in the Detroit metropolitan area of the US state of Michigan . For most of its length , the trunkline is known as Gratiot Avenue / ˈɡræʃᵻt / . The trunkline starts in Downtown Detroit and runs through the city in a northeasterly direction along one of Detroit 's five major avenues .
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The trunkline is 2.95 miles (4.75 km) long and runs through the Detroit neighborhoods of Midtown , Downtown and New Center . The trunkline starts at the intersection of Woodward Avenue in Downtown Detroit and runs through the city