S.D. Codified Laws § 32-25-19 (2026)
No person may drive any vehicle over any bridge or other elevated structure constituting a part of a highway at a speed which is greater than the maximum speed which can be maintained with safety to such bridge or structure when such structure is signposted as provided in § 32-25-18. A violation of this section is a Class 2 misdemeanor.
Source: SDC 1939, § 44.0307; SL 1970, ch 175 , § 13; SL 1989, ch 255 , § 139.