Mich. Comp. Laws § 257.687
The sections of this chapter immediately following relating to clearance and marker lamps, reflectors and stop lights shall apply as stated in said sections to vehicles of the type therein enumerated, namely: Passenger busses, trucks, truck tractors, and certain trailers, semi-trailers, and pole-trailers, respectively, when operated upon any highway, and said vehicles shall be equipped as required and all lamp equipment required shall be lighted at the times mentioned in section 684 of this chapter except that clearance and side marker lamps need not be lighted on any said vehicle when operated within any municipality where there is sufficient light to render clearly discernible persons and vehicles on the highway at a distance of 500 feet.
MCL 257.687