D.C. Mun. Regs. tit. 18, r. 18-711
Any motor vehicle may be equipped with not more than two (2) spot lamps and each lighted spot lamp shall be so aimed and used upon approaching another vehicle that no part of the high-intensity portion of the beam will be directed to the left of the prolongation of the extreme left side of the vehicle nor more than one hundred feet (100 ft.) ahead of the vehicle.
Any motor vehicle may be equipped with not more than two (2) fog lamps mounted on the front at a height not less than twelve inches (12 in.) or more than thirty inches (30 in.) above the level surface upon which the vehicle stands and so aimed that when the vehicle is not loaded none of the high-intensity portion of the light to the left of the center of the vehicle shall at a distance of twenty-five feet (25 ft.) ahead project higher than a level of four inches (4 in.) below the level of the center of the lamp from which it comes. Lighted fog lamps meeting the above requirements may be used with lower head-lamp beams as specified in § 715.
Any motor vehicle may be equipped with not more than two (2) auxiliary passing lamps mounted on the front at height not less than twenty-four inches (24 in.) or more than forty-two inches (42 in.) above the level surface upon which the vehicle stands.
Any motor vehicle may be equipped with not more than two (2) auxiliary driving lamps mounted on the front at height not less than sixteen inches (16 in.) or more than forty-two inches (42 in.) above the level surface upon which the vehicle stands.
The provisions of § 715 shall apply to any combination of head lamps and auxiliary passing lamps.
D.C. Mun. Regs. tit. 18, r. 18-711