(1) For this part, a person is authorised to drive a vehicle or combination if the person—
(a) is the operator of the vehicle or combination; or
(b) has the authority of the operator of the vehicle or combination to drive the vehicle or combination.
(2) For this part, a person is authorised to run the engine of a vehicle or combination if the person—
(a) is the operator of the vehicle or combination; or
(b) has the authority of the operator of the vehicle or combination to drive the vehicle or combination or run its engine.
(3) To avoid any doubt, a person may be authorised to drive a vehicle or combination or run its engine, whether or not the person is qualified to drive the vehicle or combination or run its engine.