Tennessee Code Title 55. Motor and Other Vehicles § 55-9-408

Headlights shall be deemed to comply with § 55-9-406, prohibiting glaring and dazzling lights, if the headlights are of a type customarily employed by manufacturers of automobiles and in addition are equipped with some anti-glare device; provided, that the anti-glare device, or any combination thereof, when properly adjusted, shall prevent any of the bright portions of the headlight beams from rising above a horizontal plane passing through the lamp centers parallel to a level road upon which the loaded vehicle stands and in no case higher than forty-two inches (42″), seventy-five feet (75′) ahead of the vehicle.