(625 ILCS 5/1-140.15)

Sec. 1-140.15. Low-speed gas bicycle. A 2 or 3-wheeled device with fully operable pedals and a gasoline motor of less than one horsepower, whose maximum speed on a paved level surface, when powered solely by such a motor while ridden by an operator who weighs 170 pounds, is less than 20 miles per hour.

(Source: P.A. 96-125, eff. 1-1-10.)