Auxiliary Routes
There are four auxiliary Interstate Highways for I-75 in Michigan. I-275 begins as a loop from northern Monroe County and continues to connect with I-96 and I-696. The freeway serves the population of western Wayne County and Detroit Metropolitan Wayne County Airport. The highway was originally intended to connect with I-75 north of Pontiac. I-375 was the shortest signed Interstate in the nation; It serves the immediate downtown Detroit area. I-475 is known as the UAW Freeway and the David Dunbar Buick Freeway. This freeway serves Flint's downtown areas as I-75 goes to the west side of the city. The fourth auxiliary Interstate is I-675, a loop into the city of Saginaw that served as an alternate to I-75 when the drawbridge over the Saginaw River was still operating.
In addition to the auxiliary Interstates, there are eight current business routes related to the freeway in the state. These business loops and spurs provide signed connections into the downtowns of Pontiac, Bay City, West Branch, Roscommon, Grayling, Gaylord, St. Ignace, and Sault Ste. Marie. A ninth highway was previously designated in Saginaw as well.
Read more about this topic: Interstate 75 In Michigan
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