Mo. Rev. Stat. § 226.680: Prohibited areas — exceptions.

No license shall be granted for the operation of a junkyard within one thousand feet of the nearest edge of right-of-way of any highway on the interstate or primary system except the following:

(1) Those screened by natural objects, plantings, fences, or other appropriate means so as to render them not visible from the traveled way of the highway involved;

(2) Those located within areas which are zoned for industrial use under authority of law;

(3) Those located within industrial areas determined by the state highways and transportation commission from actual land use to be industrial or commercial areas;

(4) Those not visible from the right-of-way of the interstate or primary system.