Mich. Comp. Laws § 560.115: Preliminary plat; state transportation department's approval or rejection.

Sec. 115.

(1) The proprietor shall submit 3 copies of the preliminary plat to the state transportation department, if any of the proposed subdivision includes or abuts a state trunk line highway or includes streets or roads that connect with or lie within the right-of-way of state trunk line highways.

(2) The state transportation department, within 30 days after receipt of the preliminary plat, shall approve it, approve it subject to conditions, or reject it. If the preliminary plat is approved, the department shall note its approval on the copy to be returned to the proprietor. If the preliminary plat is approved subject to conditions or rejected, the reasons for rejection and requirements for approval shall be given in writing to the proprietor and each of the other officers and agencies to which the proprietor was required to submit the preliminary plat under sections 113 to 115 and 117 to 119.