Sec. 547.302.  DUTY TO DISPLAY LIGHTS.  (a)  A vehicle shall display each lighted lamp and illuminating device required by this chapter to be on the vehicle:
(1)  at nighttime;  and
(2)  when light is insufficient or atmospheric conditions are unfavorable so that a person or vehicle on the highway is not clearly discernible at a distance of 1,000 feet ahead.
(b)  A signaling device, including a stoplamp or a turn signal lamp, shall be lighted as prescribed by this chapter.
(c)  At least one lighted lamp shall be displayed on each side of the front of a motor vehicle.
(d)  Not more than four of the following may be lighted at one time on the front of a motor vehicle:
(1)  a headlamp required by this chapter;  or
(2)  a lamp, including an auxiliary lamp or spotlamp, that projects a beam with an intensity brighter than 300 candlepower.
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.