South Dakota Codified Laws
Chapter 31 - Traffic Regulation
Section 9-31-3 - Speed regulation.

9-31-3. Speed regulation.
Every municipality shall have power to regulate the speed of animals, vehicles, motor vehicles, cars, and locomotives.

Source: SL 1890, ch 37, art V, §1, subdiv 21; RPolC 1903, §1229, subdiv 21; SL 1913, ch 119, §53, subdiv 21; RC 1919, §6169 (53); SDC 1939, §45.0201 (41).