S.D. Codified Laws § 31-29-2
It is a Class 2 misdemeanor for any person, corporation, or association, to place or maintain, or cause to be placed or maintained, any advertising sign, device, display, building, or structure on any of the public highways of the state. Except within municipalities, it is a Class 2 misdemeanor for any person, corporation, or association to place or maintain, or cause to be placed or maintained, any device, display, or obstruction to vision, along or adjacent to any of the public highways of the state where the device, display, or obstruction to vision, constitutes a hazard to highway traffic at any main crossing or intersection, horizontal or vertical curve or railroad crossing, as deemed hazardous by the authority in charge of the maintenance of the highway.
SDCL 31-29-2