Mich. Comp. Laws § 18.1245

Sec. 245. A sign of appropriate dimensions shall be prominently displayed at the site of each state project costing in excess of $500,000.00, or on sites where such a sign is required by other governmental units. The sign shall state the project title, the total project cost, the amount authorized to be appropriated by "the people of the state of Michigan", and the amount of federal or other grants, if any.