Business Loop Interstate 94 runs along a former alignment of U.S. Rt. 12 through Ann Arbor. It goes between exits 180 and 172. BUSN Loop I-94 passes through the following town in Washtenaw County. Ann Arbor BUSN Loop I-94 is multi-plexed in Ann Arbor County. U.S. Rt. 23, at Ann Arbor.