S.D. Codified Laws § 32-14-3
Power of local authorities--Speed limitations--Vehicle traffic and safety provisions--Exceptions
Local authorities, except as expressly authorized by chapter 32-25 and § 32-29-2 , may not alter any speed limitations declared in chapter 32-25 or enact or enforce any ordinance, charter provision, or bylaw duplicating the provisions of chapter 32-23 or enact or enforce any rule or regulation contrary to the provisions of chapters 32-14 to 32-19 , inclusive, or 32-22 and 32-24 to 32-34 , inclusive, except as provided by §§ 32-14-4 and 32-14-5 .
Source: SDC 1939, § 44.0334; SL 1974, ch 76, § 3; SL 1999, ch 151, § 5.