SDCL § 31-13-1.7: Posting of signs that no vehicle travel is advised on no maintenance road.

The board of township supervisors shall post signs on a no maintenance road to notify the motoring public that it is a no maintenance road and that no vehicle travel is advised. The signs shall be posted at each entry point and at regular intervals along a no maintenance road. A properly posted sign is prima facie evidence that adequate notice of a no maintenance road has been given to the motoring public.