As used in the Trip Tax Act:

A. “combination gross vehicle weight” means the sum total of the gross vehicle weights of all units of a combination;

B. “commercial motor carrier vehicle” means any motor vehicle with a gross weight of twelve thousand pounds or more used or reserved for use in the transportation of persons, property or merchandise for hire, compensation or profit or in the furtherance of a commercial enterprise or any vehicle used or maintained primarily for the transportation of property or merchandise or for drawing other vehicles so used or maintained;

C. “department” means the department of transportation, the secretary of transportation and any employee of the department of transportation exercising authority lawfully delegated to that employee by the secretary;

D. “gross vehicle weight” means the weight of a vehicle without load, plus the weight of any load;

E. “motor vehicle” means every vehicle which is self-propelled and every vehicle which is propelled by electric power obtained from batteries or from overhead trolley wires, but not operated upon rails;

F. “registrant” means the person who has registered the vehicle pursuant to the laws of this state or another state;

G. “trip tax” means the use fee imposed under the Trip Tax Act; and

H. “vehicle” means every device in, upon or by which any person or property is or may be transported or drawn upon a highway, including any frame, chassis or body of any vehicle or motor vehicle, except devices moved by human power or used exclusively upon stationary rails or tracks.