DescriptionThis is the interchange of M-21 and I-475 freeways under construction in Flint.jpg
English: The great highway-building era of the 1950's, 60's and 70's produced 1,700 miles of multi-lane freeways to accommodate huge growth in vehicles and travel mileage in Michigan. This is the interchange of M-21 and I-475 freeways under construction in Flint.
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