S.D. Codified Laws § 32-20-6.5
Attachment to other vehicles prohibited--Violation as misdemeanor
No person riding upon a motorcycle may attach himself or the motorcycle to any other vehicle on a roadway. A violation of this section is a Class 2 misdemeanor.
Source: SL 1970, ch 176, § 1, § 10; SL 1989, ch 255, § 98.