Montana Title 61. Motor Vehicles § 61-8-321. Drive on right side of roadway--exceptions

(1) Upon all roadways of sufficient width, a vehicle must be operated upon the right half of the roadway, except as follows:

(a) when overtaking and passing another vehicle proceeding in the same direction under the rules governing the passing movement;

(b) when the right half of a roadway is closed to traffic while under construction or repair;

(c) upon a roadway divided into three marked lanes for traffic under the rules applicable on a divided roadway;

(d) upon a roadway designated by official traffic control devices for one-way traffic;

(e) when the operator of a vehicle is complying with the provisions of 61-8-346 ;  

(f) when an obstruction exists that makes it necessary to drive to the left of the center of the roadway;  or

(g) when a police vehicle or authorized emergency vehicle is performing a job-related duty as provided in 61-8-107 .

(2) A person operating a vehicle to the left of the center of the roadway for any of the reasons provided in subsection (1) shall yield the right-of-way to all vehicles traveling in the proper direction upon the unobstructed portion of the roadway that are within a distance that constitutes an immediate hazard.

(3)(a) Except as provided in subsection (3)(b) and subject to subsection (4), upon all roadways having two or more lanes for traffic moving in the same direction, a vehicle must be driven in the right-hand lane.

(b) A vehicle being operated upon a roadway having two or more lanes for traffic moving in the same direction is not required to be driven in the right-hand lane when:

(i) overtaking and passing another vehicle proceeding in the same direction;

(ii) traveling at a speed greater than the traffic flow;

(iii) moving left to allow traffic to merge;

(iv) traveling on a roadway within the official boundaries of a city or town, except as provided in subsection (4);

(v) preparing for a left turn at an intersection or into a private road or driveway when a left turn is legally permitted;

(vi) exiting onto a left-hand exit from a controlled-access highway;

(vii) an obstruction or hazardous conditions make it necessary to drive in a lane other than the right-hand lane;

(viii) road or vehicle conditions make it safer to drive in a lane other than the right-hand lane;  or

(ix) authorized snow-removal equipment is operating on the roadway.

(4) When traveling upon an interstate highway, as defined in 60-5-102 , within the official boundaries of a city or town, a vehicle must be driven in the right-hand lane unless otherwise directed or permitted by an official traffic control device.


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