Mich. Comp. Laws § 252.313

Sec. 13. (1) A sign shall not be erected or maintained in an adjacent area where the facing of the sign is visible from an interstate highway, freeway, or primary highway except the following: (a) Directional and other official signs, including, but not limited to, signs pertaining to natural wonders, scenic and historical attractions, which are required or authorized by law, and which comply with rules promulgated by the department relative to the lighting, size, number, and spacing thereof. (b) Signs advertising the sale or lease of real property upon which they are located. (c) On-premises signs. (d) Signs located in a business area or an unzoned commercial and industrial area and that comply with sections 12, 15, 16, and 17 except that a sign not described in subdivision (a), (b), or (c) shall not be erected or maintained beyond 660 feet of the nearest edge of the right of way. (2) If the department is authorized by law to designate scenic areas along an interstate highway, freeway, or primary highway, signs shall not be erected or maintained within areas so designated unless located within a business area or an unzoned commercial or industrial area where signs may be erected or maintained in compliance with this act.