S.D. Codified Laws § 49-16A-87 (2026)
Each railroad shall construct at all points where its road crosses any public road, good, sufficient, and safe crossings and shall erect at such points, at a sufficient elevation from the road to admit free passage of vehicles of every kind, a sign with large and distinct letters giving notice of the proximity of the road and warning persons of the necessity for looking out for trains.
Source: SDC 1939, § 52.0923; SDCL, § 49-25-16; SL 1980, ch 322 , § 86.