1974 : Speed Limit Lowered to 55 MPH In Michigan

March 2, 2018 all-day

On March 2, 1974, highway speed limits were reduced to 55 miles per hour to comply with federal legislation aimed at reducing energy consumption, adding an hour and 10 minutes to the trip between Detroit and the Upper Peninsula.

Source: Historical Society of Michigan and the Pasty Central Day in History : March 2

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