40-6-46.
   
  (a) The Department of Transportation and local authorities are
  authorized to determine those portions of any highway under their
  respective jurisdictions where overtaking and passing or driving to
  the left side of the roadway would be especially hazardous and may,
  by appropriate signs or markings on the roadway, indicate the
  beginning and end of such zones and, when such signs or markings are
  in place and clearly visible to an ordinarily observant person,
  every driver of a vehicle shall obey the directions thereof. Such
  no-passing zones shall be clearly marked by a solid barrier line
  placed on the right-hand element of a combination stripe along the
  center or lane line or by a solid double yellow line.
   
  (b) Where signs or markings are in place to define a no-passing zone
  as set forth in subsection (a) of this Code section, no driver shall
  at any time drive on the left side of the roadway within such
  no-passing zone or on the left side of any pavement striping
  designed to mark such no-passing zone throughout its length.
   
  (c) This Code section does not apply under the conditions described
  in paragraph (2) of subsection (a) of Code Section 40-6-40 nor to
  the driver of a vehicle turning left into or from an alley, private
  road, or driveway.