High Quality Content by WIKIPEDIA articles! M-8 is a 5.491-mile (8.837 km) state trunkline highway in the U.S. state of Michigan lying within the cities of Detroit and Highland Park. Much of it is the Davison Freeway, the nation`s first urban depressed freeway, which became a connector between the Lodge (M-10) and the Chrysler (I-75) Freeways.