S.D. Codified Laws § 31-7-10 (2026)
The department may use such state highway funds as are required by federal highway acts for matching federal funds allocated for construction on the interstate system.
Source: SL 1955, ch 104 , § 5; SDC Supp 1960, § 28.0235; SL 1963, ch 163 ; SL 2010, ch 145 , § 57.