Montana Title 61. Motor Vehicles § 61-8-211. Lane use control signals

(1) An operator of a vehicle may drive in the lane over which a steady downward green arrow signal is located.

(2) An operator of a vehicle must be prepared to vacate, in a safe manner, the lane over which a steady yellow X signal is located because a lane control change is being made to a steady red X signal.

(3) An operator of a vehicle may not use the lane over which the steady red X signal is located.

(4) An operator of a vehicle may use a lane over which a steady white two-way left-turn arrow signal is located for a left turn but not for through travel. The operator must be aware that common use of the lane by oncoming vehicular traffic is also permitted.

(5) An operator of a vehicle may use a lane over which a steady white one-way left-turn arrow signal is located for a left turn but not for through travel.