Mich. Comp. Laws § 252.305: Signs subject to act.

Sec. 5.

A person shall not engage or continue to engage in outdoor advertising through the erection, use or maintenance of any signs in an adjacent area where the facing of the sign is visible from an interstate highway, freeway, or primary highway, except as provided in this act. A sign having a facing visible from more than 1 state highway or other public road shall comply with the requirements for outdoor advertising for each state highway and each public road from which it is visible.