(a) This part shall apply to all junkyards located on all highways designated by the State Highway Commission as interstate highways or primary highways, and which can be screened using:
- (1) Natural objects;
- (2) Plantings;
- (3) Fences; or
- (4) Other appropriate means.
- (b) This part does not apply to junkyards in zoned industrial areas, zoned by an authorized zoning commission, or those which exist in an unzoned industrial area as determined by an agreement between the State Highway Commission and the United States Department of Transportation.