Mich. Comp. Laws § 252.204a

Sec. 4a. A junkyard which is lawfully in existence on the effective date of this act, which does not conform to subsections (a) or (b) of section 3 and is located along a secondary highway, shall be screened at a cost to the owner. However, screening of such a junkyard shall not be required in excess of an 8 foot fence. A junkyard which is established after the effective date of this act and is located along a secondary highway shall be adequately screened or removed in accordance with section 3 of this act at a cost to the owner.