Mich. Comp. Laws § 324.41903
The department shall designate closure notice signs of approved material, overall size, number, and letter size and composition of message. At least 4 notices, relatively equally spaced, shall be posted on the boundaries of the closed area. A closure is not effective prior to the erection of closure notices by the petitioning political subdivisions and approval of the same by the department. The petitioning political subdivision shall place and maintain the signs and shall publish a notice of closure for 3 successive weeks, at least once in each week, in a newspaper published in the county in which the area to be closed is located. If no newspaper is published in the county, then the notice shall be published in a newspaper published in an adjoining county. If, in the judgment of the department, closure signs are not maintained so as to adequately give notice of the closure to a careful and prudent person, the closure may be rescinded by service of notice of rescission on the clerk or recording officer of the political subdivision, and in such case the closure shall terminate 30 days after service of notice of rescission.
MCL 324.41903