US Highway 12 (US 12) is a US Highway that runs from Aberdeen, Washington, to Detroit, Michigan. In Michigan it runs for 210 miles (338 km) between New Buffalo and Detroit as a state trunkline highway and Pure Michigan Byway. On its western end, the highway is mostly a two-lane road that runs through the southern tier of counties roughly parallel to the Indiana state line. It forms part of the Niles Bypass, a four-lane expressway south of Niles and runs concurrently with Interstate 94 (I-94) around the south side of Ypsilanti. In between Coldwater and the Ann Arbor area, the highway angles northeasterly and passes the Michigan International Speedway.