Idaho Statutes Title 49. Motor Vehicles § 49-630. Drive on right side of roadway--Exceptions

(1) Upon all highways of sufficient width a vehicle shall be driven upon the right half of the roadway except as follows:

(2) Upon all highways any vehicle proceeding at less than normal speed of traffic at the time and place and under the conditions then existing, shall be driven in the right-hand lane available for traffic, or as close as practicable to the right-hand curb or edge of the highway, except when overtaking and passing another vehicle proceeding in the same direction or when preparing for a left turn at an intersection or into a private road or driveway.

(3) No vehicle shall be driven to the left of the center line upon any highway having four (4) or more lanes for moving traffic and providing for two-way movement of traffic, except when authorized by a traffic control device designating certain lanes to the left side of the center of the highway for use by traffic not otherwise permitted to use such lanes, or except as permitted under subsection (1)(b) of this section. This subsection shall not be construed as prohibiting the crossing of the centerline in making a left turn into or from an alley, private road or driveway.