Mich. Comp. Laws § 247.810

Sec. 10. Documents and instruments of any kind authorized to be issued or executed by the commission shall be issued or executed in the name of the "Michigan state highway commission" by the chairman of the commission, or to the extent expressly authorized by bylaw or resolution, by the vice chairman, other member, director, or other subordinate. Documents or instruments which convey interests or rights in land shall be executed by the chairman or vice chairman and the director or a deputy director designated by the commission.