625 ILCS 5/1-146

Every vehicle which is self-propelled and every vehicle which is propelled by electric power obtained from overhead trolley wires, but not operated upon rails, except for vehicles moved solely by human power, motorized wheelchairs, low-speed electric bicycles, and low-speed gas bicycles. For this Act, motor vehicles are divided into two divisions: First Division: Those motor vehicles which are designed for the carrying of not more than 10 persons. Second Division: Those motor vehicles which are designed for carrying more than 10 persons, those motor vehicles designed or used for living quarters, those motor vehicles which are designed for pulling or carrying freight, cargo or implements of husbandry, and those motor vehicles of the First Division remodelled for use and used as motor vehicles of the Second Division.