High Quality Content by WIKIPEDIA articles! At only 1.06 miles (1.71 km) in length, Interstate 375 (I-375) in Detroit has the distinction of being the shortest signed Interstate Highway that is up to Interstate Standards. Only the unsigned I-878, I-110, and I-315 are shorter. I-375 is the southernmost leg of the Walter P. Chrysler Freeway. It is a spur off of I-75 into downtown Detroit to end at the unsigned Business Spur Interstate 375 (BS I-375), better known as Jefferson Avenue. The freeway opened on June 12, 1964.