Any junkyard lawfully in existence on October 1, 1969, that is within one thousand feet (1,000') of the nearest edge of the right-of-way and visible from the main traveled way of any highway on the interstate or primary system, shall be screened, if feasible, by the department at locations on the highway right-of-way or in areas acquired for those purposes outside the right-of-way, so as not to be visible from the main traveled way of the highways, and the operator shall pay the cost of installation. The commissioner is authorized to seek federal aid funds available for the purpose of screening to help defray the operation cost.