"Properly displayed" means 2 motor fuel use tax decals, one placed on each side of the exterior of the cab. In the case of transporters, manufacturers, dealers, or driveaway operations, the decals need not be permanently affixed but may be temporarily displayed in a visible manner on the exterior sides of the cab.
"Commercial motor vehicle" means a motor vehicle used, designed, or maintained for the transportation of people or property and either having 2 axles and a gross vehicle weight or registered gross vehicle weight exceeding 26,000 pounds or 11,793 kilograms, or having 3 or more axles regardless of weight, or that is used in combination, when the weight of the combination exceeds 26,000 pounds or 11,793 kilograms gross vehicle weight or registered gross vehicle weight except for motor vehicles operated by this State or the United States, recreational vehicles, school buses, and commercial motor vehicles operated solely within this State for which all motor fuel is purchased within this State.
"Motor carrier" means any person who operates or causes to be operated any commercial motor vehicle on any highway within this State.
625 ILCS 5/11-1419.03