§47-11-301.

§47-11-301.
   
   (a) 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 an obstruction exists making it necessary to drive to the left
   of the center of the highway; provided, any person so doing shall
   yield the right-of-way to all vehicles traveling in the proper
   direction upon the unobstructed portion of the highway within such
   distance as to constitute an immediate hazard;
   
   3. Upon a roadway divided into three marked lanes for traffic under
   the rules applicable thereon;
   
   4. Upon a roadway restricted to one-way traffic; or
   
   5. Upon a roadway having four or more lanes for moving traffic and
   providing for two-way movement of traffic.
   
   (b) Upon all roadways any vehicle proceeding at less than the normal
   speed of traffic at the time and place and under the conditions then
   existing shall be driven in the right-hand lane when available for
   traffic, or as close as practicable to the right-hand curb or edge of
   the roadway and may be temporarily driven upon the right-hand shoulder
   for the purpose of permitting other vehicles to pass. This subsection
   shall not apply 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.
   
   (c) Upon any roadway having four or more lanes for moving traffic and
   providing for two-way movement of traffic, no vehicle shall be driven
   to the left of the center line of the roadway, except when authorized
   by official traffic control devices designating certain lanes to the
   left side of the center of the roadway for use by traffic not
   otherwise permitted to use such lanes, or except as permitted under
   paragraph 2 of subsection (a) of this section. However, this
   subsection shall not be construed as prohibiting the crossing of the
   center line in making a left turn into or from an alley, private road
   or driveway.