S.D. Codified Laws § 32-20-4 (2026)
No person under eighteen years of age may operate or ride upon a motorcycle on the public streets or highways of this state unless the person wears a protective helmet of a type meeting Department of Transportation Motor Vehicle Safety Standard 218 as in effect on January 1, 1984. No person may operate a motorcycle with any person under the age of eighteen as a passenger if the passenger is not wearing a protective helmet. A violation of this section is a Class 2 misdemeanor.
Source: SL 1967, ch 215 , § 4; SL 1970, ch 176 , § 2; SL 1974, ch 219 , § 23; SL 1976, ch 194 , § 1; SL 1978, ch 230 , § 9; SL 1980, ch 224 ; SL 1984, ch 228 , § 8; SL 1987, ch 231 , § 2; SL 1989, ch 255 , § 93.