S.D. Codified Laws § 32-17-5
The headlamps of motor vehicles shall be so constructed, arranged, and adjusted that, except as provided in § 32-17-7, they shall at all times mentioned in § 32-17-4 and under normal atmospheric conditions and on a level road produce a driving light sufficient to render clearly discernible a person two hundred feet ahead. However, headlamps may not project a glaring or dazzling light to persons in front of such headlamps. Any vehicle equipped with a four lamp headlight system shall have all lamps lighted on high beam, if such system was designed by the manufacturer to require all four headlamps be lighted, and shall have the two low beam lamps lighted on low beam when headlamps are lighted as required in § 32-17-4. Every motor vehicle, except those excluded in § 32-17-1, shall be equipped with a high beam indicator lamp which shall be lighted whenever the vehicle headlamps are on high beam position. A violation of this section is a Class 2 misdemeanor.
SDCL 32-17-5