S.D. Codified Laws § 32-30-21
Backing prohibited on controlled-access highway--Violation as misdemeanor
The driver of a vehicle may not back the vehicle upon any shoulder or roadway of any controlled - access highway. A violation of this section is a Class 2 misdemeanor.
Source: SL 1970, ch 175, § 31, § 10; SL 1989, ch 255, § 206.