"Electric-assisted bicycle" means a bicycle with two or three wheels, a saddle, fully operative pedals for human propulsion, and an electric motor of less than 750 watts that meets the requirements of one of the following three classes:
(a) "Class 1 electric-assisted bicycle" means an electric-assisted bicycle equipped with a motor that provides assistance only when the rider is pedaling and ceases to provide assistance when the bicycle reaches the speed of 20 miles per hour;
(b) "class 2 electric-assisted bicycle" means an electric-assisted bicycle equipped with a motor that may be used exclusively to propel the bicycle and is not capable of providing assistance when the bicycle reaches the speed of 20 miles per hour; or
(c) "class 3 electric-assisted bicycle" means an electric-assisted bicycle equipped with a motor that provides assistance only when the rider is pedaling and ceases to provide assistance when the bicycle reaches the speed of 28 miles per hour.