No person driving a motor vehicle shall transport any animal in the back of the vehicle in a space intended for any load on the vehicle on a highway unless the space is enclosed or has side and tail racks to a height of at least 46 inches extending vertically from the floor and the vehicle has installed means of preventing the animal from being discharged, and/or the animal is cross tethered to the vehicle or is protected by a secured container or cage, in a manner which will prevent the animal from being thrown, falling, or jumping from the vehicle.