Nothing contained in this subchapter shall prohibit the establishment, maintenance, and operation of outdoor junkyards, automobile graveyards, and scrap metal processing facilities within one thousand feet (1000') of the nearest edge of the right-of-way of interstate or primary state highways:
(1) Within those areas which are zoned industrial under authority of the laws of this state;
(2) Within those unzoned industrial areas which may be determined by agreement between the State Highway Commission and the United States Secretary of Transportation; or
(3) Within other areas, when effectively screened as not to be visible from any point on the main-traveled way of such interstate or primary state highway.