S.C. Code § 57-27-50
Any junkyard lawfully in existence on March 24, 1966, which is within one thousand feet of the nearest edge of the right-of-way and visible from the main-traveled way of any highway on the interstate or federal aid primary system and any junkyard lawfully in existence along any highway which may be hereafter designated as an interstate or federal aid primary highway and which does not conform to the requirements for exception under Section 57-27-40, shall be screened if feasible by the department at locations on the highway right-of-way or in areas acquired for such purposes outside the right-of-way so as not to be visible from the main-traveled way of such highways. After a junkyard has been screened by the department, no junkyard owner or operator shall permit the placement of junk so that it may be seen above or beyond the screen, or otherwise become visible. Junkyard owners or operators violating the provisions of this section shall be subject to the penalties provided in Section 57-27-80; provided, however, that no junkyard owner or operator shall be charged under this section unless he has been notified in writing by the department of the alleged violation and allowed thirty days to comply with the requirements of this section.
S.C. Code § 57-27-50