BICYCLE LIGHTS LAW REQUIREMENTS IN Montana
61-8-607. Lamps and other equipment on bicycles and mopeds. (1) A bicycle or moped when in use at dawn, dusk, or nighttime must be equipped with:
(a) a lamp on the front emitting a white light visible from a distance of at least 500 feet to the front. In lieu of a lamp affixed to the bicycle [or moped], a bicyclist may use a lamp with equal intensity and visibility affixed to the cyclist's helmet and facing forward.
(b) facing the rear, either a lamp emitting a red light visible from a distance of at least 500 feet to the rear or a red reflector visible from a distance of at least 500 feet to the rear when illuminated by low-beam motor vehicle headlamps; and
(c) reflective material large and reflective enough to be visible from the left and right sides from a distance of at least 500 feet when illuminated by low-beam motor vehicle headlamps.
(2) A bicycle or moped must be equipped with a brake enabling the operator to stop the bicycle [or moped] within no more than 25 feet from a speed of 10 miles an hour on dry, level, clean pavement.