S.D. Codified Laws § 32-26-21.2
"Electric personal assistive device" defined
For the purposes of §§ 32-26-21.2 to 32-26-21.3 , inclusive, the term, electric personal assistive device, means a self - balancing two non - tandem wheeled device, designed to transport only one person, with an electric propulsion system that limits the maximum speed of the device to fifteen miles per hour or less.
Source: SL 2002, ch 161, § 1.