Montana Title 61. Motor Vehicles § 61-9-206. Stop lamps--when required

(1) A person may not sell a new motor vehicle in this state or drive a vehicle on the highways unless it is equipped with at least two properly functioning stop lamps. A vehicle manufactured before January 1, 1956, and all motorcycles, quadricycles, and motor-driven cycles must be equipped with at least one properly functioning stop lamp.

(2) The stop lamp or lamps on the rear of a vehicle must display a red light that is actuated upon application of the service (foot) brake and, in a vehicle manufactured or assembled on or after January 1, 1964, must be visible from a distance of not less than 300 feet to the rear in normal sunlight. In a vehicle manufactured or assembled before January 1, 1964, the stop lamp or lamps must be visible from a distance of not less than 100 feet. The stop lamp may be incorporated with one or more other rear lamps.

(3) A stop lamp may not project a glaring light.