South Dakota Codified Laws
Chapter 20B - Bicycle Regulation
Section 32-20B-13 - Age restrictions for Class III electric bicycle.

32-20B-13. Age restrictions for Class III electric bicycle.
To operate a Class III electric bicycle in this state, a person shall be at least sixteen years of age. This section does not prohibit a person younger than sixteen years of age from riding as a passenger on a Class III electric bicycle, if the bicycle is designed to accommodate a passenger.

Source: SL 2019, ch 135, ยง5.