S.D. Codified Laws § 32-26-18.1
Current with legislation signed by the governor on or before 3/6/2024
No person may turn a vehicle at an intersection unless the vehicle is in proper position upon the roadway as required by §§ 32-26-17 and 32-26-18. A signal of intention to turn right or left when required shall be given continuously during not less than the last one hundred feet traveled by the vehicle before turning. A violation of this section is a Class 2 misdemeanor.
SDCL 32-26-18.1