S.D. Codified Laws § 32-25-5.1
Current with legislation signed by the governor on or before 3/6/2024
No person may drive a motor vehicle at such a slow speed as to impede the normal and reasonable movement of traffic except when reduced speed is necessary for safe operation or in compliance with law. A violation of this section is a Class 2 misdemeanor.
SDCL 32-25-5.1