S.D. Codified Laws § 32-14-3
Current with legislation signed by the governor on or before 3/6/2024
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.
SDCL 32-14-3