SDCL § 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.