Mich. Comp. Laws § 324.11707: Display on both sides of septage waste vehicle.

Sec. 11707.

Each septage waste vehicle for which a septage waste vehicle license has been issued shall display on both sides of the septage waste vehicle in letters not less than 2 inches high the words "licensed septage hauler", the vehicle license number issued by the department, and a seal furnished by the department that designates the year the septage waste vehicle license was issued.