S.D. Codified Laws § 32-26-3
Passing oncoming vehicles to right--Yielding one-half of highway--Violation as misdemeanor
Drivers of vehicles proceeding in opposite directions shall pass each other to the right, each giving to the other at least one - half of the main - traveled portion of the roadway as nearly as possible. A violation of this section is a Class 2 misdemeanor.
Source: SDC 1939, § 44.0311; SL 1989, ch 255, § 143.