It shall be a Class 1 misdemeanor to erect or display any sign endangering the public or other guide or warning signs upon the trunk highway system except in case of emergency or when approved by the Department of Transportation.
S.D. Codified Laws § 31-28-8
Erection of unofficial signs prohibited--Misdemeanor--Emergencies--Approval by Department of Transportation
Source: SL 1919, ch 333, § 53; SL 1923, ch 284, § 4; SDC 1939, §§ 28.0901, 28.9903; SL 1941, ch 130; SDCL, § 31-28-9.
Official source: South Dakota Legislature. Reproduced from public-domain South Dakota statutes; confirm against the official source for the current text. Not legal advice.