Montana Title 61. Motor Vehicles § 61-8-318. Rotary traffic islands and roundabouts--definitions

(a) may be driven only to the right of the island or to the right of the center of the roundabout;  and

(b) has right-of-way over all vehicles approaching the island or roundabout.

(2)(a) A vehicle approaching a rotary traffic island or a roundabout must yield the right-of-way to all vehicles passing around the island or roundabout.

(b) A vehicle approaching a roundabout may not enter the roundabout in a manner that interferes with the travel of a towing vehicle simultaneously entering the roundabout.

(3)(a) If the approach to a rotary traffic island or roundabout has multiple lanes of traffic for travel in the same direction, a towing vehicle may, with due regard for all other traffic, deviate from its lane in order to safely approach or pass around the island or roundabout.  Vehicles traveling in the same direction as the hauling vehicle must yield the right-of-way and may not attempt to pass.

(b) If a towing vehicle is poised to enter a roundabout simultaneously with a second towing vehicle, the vehicle to the left has the right-of-way and the vehicle to the right must yield.

(a) “Roundabout” means a circular intersection.

(b) “Towing vehicle” means a vehicle that is towing one or more vehicles.