Mich. Comp. Laws § 257.697b: Rear stop lamps.

Sec. 697b.

A person shall not sell or offer for sale or operate on the highways a vehicle manufactured or assembled after January 1, 1965, except those exempted from certificate of title requirements under the provisions of section 216, unless the vehicle is equipped with 2 rear stop lamps except on a motorcycle or moped meeting the requirements of section 697. A motorcycle or moped shall be required to have 1 rear stop lamp.