As used in this part unless the context otherwise requires:

“Director” means the director of transportation.

“Gross vehicle weight rating” means the value specified by the manufacturer as the loaded weight of a single vehicle. When there is no value specified by the manufacturer as the loaded weight of a single vehicle, the value shall be determined in accordance with rules adopted by the director.

“Motor carrier” as used in this part means any person who owns a motor vehicle used in, or engages in the transportation of persons or property by motor vehicle on the public highways in the furtherance of any commercial, industrial, or educational enterprise.

“Motor carrier vehicle” means any motor vehicle or vehicle, including integrally mounted equipment and specially constructed motorized equipment, used by a motor carrier to transport passengers or property on the public highways.