M-4 (Michigan highway)
M-4, was formerly the designation of two different routes in the US state of Michigan.
- M-4 (1936–1939 Michigan highway) was the original designation of M-134 in Mackinac and Chippewa counties.
- M-4 (1979–1986 Michigan highway) was the original designation of M-10 (Northwestern Highway) from I-696/US 24 to the northern terminus.
| Browse numbered routes | ||||
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←  M-3 | MI | →  M-5 | ||