Mich. Comp. Laws § 257.697: Signal lamps or devices; exemption.

Sec. 697.

A motor vehicle may be equipped and when required under this chapter shall be equipped with the following signal lamps or devices:

A stop lamp on the rear which shall emit a red or amber light and which shall be actuated upon application of the service or foot brake and which may but need not be incorporated with a tail lamp.

A lamp or lamps or mechanical signal device which conveys an intelligible signal or warning to another driver approaching from the rear.

A stop lamp shall be capable of being seen and distinguished from a distance of 100 feet to the rear both during normal sunlight and at nighttime and a signal lamp or lamps indicating intention to turn shall be capable of being seen and distinguished during daytime and nighttime from a distance of 100 feet both to the front and rear. When a vehicle is equipped with a stop lamp or other signal lamps, the lamp or lamps shall at all times be maintained in good working condition. A stop lamp or signal lamp shall not project a glaring or dazzling light.

All mechanical signal devices shall be self-illuminated when in use at the times mentioned in section 684.

A motor vehicle licensed as an historic vehicle is exempt from the requirements of this section if the vehicle as originally equipped failed to meet these requirements.