In October 1969, AASHO approved a realignment of US 10 in the Detroit area; the next year the designation was rerouted to follow the Lodge Freeway (what is now M-10) and the portion of Jefferson Avenue between the Lodge Freeway and Randolph Street (then US 25, now M-3). The M-1 designation was applied to the section of Woodward Avenue from Jefferson Avenue in downtown Detroit to Square Lake Road along the southern border of Pontiac. Woodward north of Square Lake Road was designated as a business route of both US 10 and I-75. When US 10 was truncated to Bay City in 1986, the Bus. US 10 portion of Woodward became Bus. US 24.