Mich. Comp. Laws § 560.150: State highway commission's certificate.

Sec. 150.

A certificate shall be signed and dated by the state highway commission or by an official of the department of state highways, authorized by the commission to certify its approval on plats.

The certificate shall signify that:

The plat has been reviewed and conforms to the requirements of this act and the commission's published rules and regulations relative to streets, roads and highways under its jurisdiction.

The plat has the commission's approval.