D.C. Mun. Regs. tit. 18, r. 18-708
Front clearance lamps and those marker lamps and reflectors mounted on the front or on the side near the front of a vehicle shall display or reflect an amber color.
Rear clearance lamps and those marker lamps and reflectors mounted on the rear or on the sides near the rear of a vehicle shall display or reflect a red color.
All lighting devices and reflectors mounted on the rear of any vehicle shall display or reflect a red color, except as provided in § 708.4.
The stop light or other signal device mounted on the rear of a vehicle may be red, amber, or yellow; the light illuminating the license plate shall be white; and the light emitted by a back-up lamp shall be white.
Reflectors, when required by § 707 shall be mounted at a height of not less than twenty-four inches (24 in.) and not higher than sixty inches (60 in.) above the ground on which the vehicle stands, except that if the highest part of the permanent structure of the vehicle is less than twenty-four inches (24 in.), the reflector at that point shall be mounted as high as that part of the permanent structure will permit.
The rear reflectors on a pole trailer may be mounted on each side of the bolster or load.
Any required red reflector on the rear of a vehicle may be incorporated with the tail lamp, but such reflector shall meet all of the other reflector requirements of this chapter.
Vehicles titled or registered before January 1, 1956, may have the reflectors mounted less than twenty-four inches (24 in.), but not less than twenty inches (20 in.), above the ground.
Clearance lamps shall be mounted on the permanent structure of the vehicle in a manner which will indicate the extreme width of the vehicle, and as near the top of the vehicle as practicable.
Clearance lamps and side marker lamps may be mounted in combination; Provided, that illumination is given as required herein with reference to both and on busses when the outside windows are illuminated.
All reflectors, clearance lamps, and marker lamps shall conform to the standards and specifications of the Society of Automotive Engineers applicable to such equipment current at the time the devices are attached.
D.C. Mun. Regs. tit. 18, r. 18-708