S.D. Codified Laws § 32-26-4
Current with legislation signed by the governor on or before 3/6/2024
The driver of a motor vehicle traversing defiles, canyons, or mountain highways shall hold such motor vehicle under control and as near the right-hand side of the highway as reasonably possible. A violation of this section is a Class 2 misdemeanor.
SDCL 32-26-4