(a) "Commercial tractor" means every motor vehicle having motive power designed or used for drawing other vehicles and not so constructed as to carry any load thereon, or designed or used for drawing other vehicles while carrying a portion of such other vehicles, or the load thereon, or both.
(ORC 4511.01(I))
(b) "Commercial vehicle" means a vehicle designed for the carrying of freight or merchandise, or which is licensed by the State as a commercial car.
(c) "Commercial car" means any motor vehicle having motor power designed and used for carrying merchandise or freight, or used as a commercial tractor.
(ORC 4501.01(J))