Interstate 475 forms an urban loop joining Interstate 75 with Downtown Flint from the west. The freeway carries four lanes north to Exit 4 (Bristol Road), six lanes north to Exit 13 (Saginaw Street) and four lanes along the rural stretch west back to I-75. A four-level interchange joins the below grade freeway with Interstate 69 amid ramps to Downtown.
Interstate 475 was designated as a 17.5-mile freeway through Flint in 1970.1 The second level of the stack interchange with Interstate 69 opened as part of the M-21 and M-78 freeway completed from Saginaw Street to Center Road on December 21, 1971.2 Opening of the first two sections of the I-475 mainline occurred by 1973. The southern portion ran north 6.4 miles from I-75 to the M-21 freeway near Downtown Flint. The northern 3.4-mile portion connected I-75 east with Saginaw Street (Exit 13).3 The remaining section of I-475 was finished in 1981.1