§ 17-42. Duty to keep to right; exceptions.

Upon all roadways of sufficient width a vehicle shall be driven upon the right half of the roadway, except as follows:

(1)

When overtaking and passing another vehicle proceeding in the same direction under the rules governing such movement;

(2)

When the right half of a roadway is closed to traffic while under construction or repair;

(3)

Upon a roadway divided into three (3) or more marked lanes for traffic under the rules applicable thereon;

(4)

Upon a roadway designated and signposted for one-way traffic;

(5)

When directed otherwise by a police officer; or

(6)

When necessary to avoid an accident.

State law reference

Similar provisions, MCA 1972 § 63-3-601.