S.D. Codified Laws § 32-25-1.1 (2026)
Except as provided by § 32-25-4 or pursuant to § 32-25-7, no person may drive a vehicle upon a street or highway at a speed in excess of sixty-five miles per hour. A violation of this section is a Class 2 misdemeanor.
Source: SL 1941, ch 187 , § 2; SL 1959, ch 251 , § 1; SDC Supp 1960, § 44.0303; SL 1965, ch 192 ; SDCL, § 32-25-1 ; SL 1970, ch 175 , § 7; SL 1989, ch 255 , § 121; SL 1996, ch 207 , § 2.