Montana Title 61. Motor Vehicles § 61-8-607. Lamps and other equipment on bicycles, mopeds, or motorized scooters

(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, moped, or motorized scooter, a rider may use a lamp with equal intensity and visibility affixed to the rider'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.  In lieu of a lamp affixed to the bicycle, moped, or motorized scooter, a rider may use a red lamp with equal intensity and visibility affixed to the rider and facing the rear.

(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.