Mich. Comp. Laws § 252.204

Sec. 4. Any junkyard lawfully in existence on the effective date of this act which does not conform to the requirements for exception in section 3 and any other junkyard along any highway hereafter designated as an interstate or primary highway and which does not conform to the requirements for exception in section 3, shall be screened or removed by the state highway department as a cost of constructing state trunk line highways. Nonconforming junkyards existing on the effective date of this act shall be removed or screened by July 1, 1970.