As used in this Article:
(1) "Commercial driver training school" or "school" means a business enterprise conducted by an individual, association, partnership or corporation which educates or trains persons to operate or drive motor vehicles, administers road tests pursuant to G.S. 20-329, or which furnishes educational materials to prepare an applicant for an examination given by the State for a driver's license or learner's permit, and charges a consideration or tuition for such service or materials.
(2) "Commissioner" means the Commissioner of Motor Vehicles.
(3) "Instructor" means any person who operates a commercial driver training school or who teaches, conducts classes, gives demonstrations, administers road tests, or supervises practical training of persons learning to operate or drive motor vehicles in connection with operation of a commercial driver training school.