(a) The State Highway Administration may determine those parts of any highway in its jurisdiction where overtaking and passing or driving on the left of the roadway would be especially dangerous and, by appropriate signs or markings on the roadway, may indicate the beginning and end of these zones. Where the signs or markings are in place and clearly visible to an ordinarily observant individual, every driver of a vehicle shall obey their directions.
(b) Except as provided in subsection (d) of this section, where signs or markings defining a no-passing zone are placed as provided in subsection (a) of this section, a driver may not drive on the left side of the roadway within the no-passing zone.
(c) Except as provided in subsection (d) of this section, where signs or markings defining a no-passing zone are placed as provided in subsection (a) of this section, a driver may not drive on the left side of any pavement striping designed to mark the no-passing zone throughout its length.
(d) The driver of a vehicle may drive across the left side of the roadway in a no-passing zone while making a left turn, but only if it is safe to do so.