Mich. Comp. Laws § 247.42

Sec. 2. If the official or officials having jurisdiction over the highways of a village or city in this state desire to abandon, discontinue, vacate, or alter the course of a public highway referred to in section 1, and the abandonment, discontinuation, vacation, or alteration will result in the loss of public access, before any action is taken by the public official or officials of a village or city, an application signed by not less than 21 landowners of the village or city in which the highway is situated, shall be made to the circuit court for the county in which the highway is located, setting forth the particular circumstances of the case, an accurate description of the highway proposed to be abandoned, discontinued, vacated, or altered, together with the reasons for the proposed abandonment, discontinuation, vacation, or alteration. The application shall be substantiated by oath by 5 or more of the persons signing the application.