Oklahoma law on the subject...
A. At all times specified in subsection B of Section 12-201 of this title, at least two lighted headlamps shall be displayed, one on each side at the front of every motor vehicle, except when such vehicle is parked subject to the regulations governing lights on parked vehicles, as provided in Section 12-214 of this title.
B. Whenever a motor vehicle equipped with headlamps as herein required is also equipped with any auxiliary driving lamps or a spot lamp or any other lamp on the front thereof projecting a beam of intensity greater than three hundred (300) candlepower, not more than a total of four of any such lamps on the front of a vehicle shall be lighted at any one time when upon a highway.
C. The driver of any vehicle shall comply with the provisions of Section 12-217 of this title regarding the use of alternate headlamp equipment.
A. The United States Department of Transportation specifications and standards for headlamps, auxiliary driving lamps, tail lamps, signal lamps, reflectors, and other lighting equipment and signal devices, pursuant to 49 C.F.R., Section 571.108, are hereby adopted by the State of Oklahoma.
B. Except as otherwise provided in this chapter and subject to exceptions for parked vehicles, every vehicle upon a highway within this state shall properly display all lamps and illuminating devices as required by law:
1. At any time from one-half (1/2) hour after sunset to one-half (1/2) hour before sunrise, also referred to in this chapter as nighttime; and
2. At any other time when, due to insufficient light or unfavorable atmospheric conditions, persons and vehicles on the highway are not clearly discernible at a distance of one thousand (1,000) feet or less.
C. All lamps required by this chapter shall display a steady light except as otherwise prescribed by this chapter. Any required individual lamp may be combined or incorporated with any other required individual lamp if the combined or incorporated lamps meet all of the individual lighting requirements of this chapter for each individual lamp contained therein.
D. No lamp, other than a headlamp, displayed on any vehicle shall project a glaring light; provided, every headlamp shall comply with Section 12-222 of this title.
A. As used in this article:
1. "Auxiliary driving lamp" means a lamp mounted to provide illumination to the front of a motor vehicle;
2. "Daytime running lamp" means a lamp mounted to provide illumination to the front of a motor vehicle that will assist to identify its presence to other vehicles and pedestrians at times other than those specified in subsection B of Section 12-201 of this title;
3. "Front fog lamp" means a lamp mounted to provide illumination to the front of a motor vehicle during conditions of rain, snow, fog, dust, or other atmospheric disturbances;
4. "Rear fog lamp" means a lamp mounted to provide illumination to the rear of a motor vehicle during conditions of rain, snow, fog, dust, or other atmospheric disturbances;
5. "Off-road lamp" means any lamp designed and manufactured solely for off-road use; and
6. "Spot lamp" means a movable lamp which emits a brilliant light with a focused beam for examining objects, street address numbers, and other things alongside the road.
B. Any motor vehicle may be equipped with not to exceed two spot lamps which shall not be used in substitution of headlamps.
C. The operator of any motor vehicle:
1. Which has in use a spot lamp shall, upon the approach of another vehicle from any direction within one thousand (1,000) feet, immediately turn said spot lamp off;
2. Shall not use or turn on a spot lamp when approaching or following another motor vehicle within one thousand (1,000) feet; and
3. Shall not use or turn on a spot lamp to cause a vehicle to yield right-of-way or stop.
The provisions of this subsection shall not apply to operators of authorized emergency vehicles.
D. 1. A motor vehicle may be equipped with not to exceed two front fog lamps or two rear fog lamps which shall only be used when visibility, as described in paragraphs 3 and 4 of subsection A of this section, is limited to one-half (1/2) mile or less.
2. Front fog lamps shall be mounted on the same level on opposite sides of the front of the vehicle at or below the level of the headlamps. Front fog lamps may be used with lower beam headlamps or switch controlled in conjunction with the headlamps and may be used, at the discretion of the driver, with either low or high beam headlamps. Front fog lamps shall not be used in substitution of headlamps, when headlamps are required.
E. A motor vehicle may be equipped with not to exceed two auxiliary driving lamps mounted at a height of more than forty-two (42) inches from the ground. The auxiliary driving lamps may be used with lower beam headlamps or switch controlled in conjunction with the headlamps and may be used, at the discretion of the driver, with either low or high beam headlamps.
F. Every fog lamp or auxiliary driving lamp used upon a motor vehicle shall be so adjusted and aimed that no part of the high intensity portion of the beam shall, at a distance of twenty-five (25) feet, rise above the horizontal plane passing through the center of the lamp.
G. Notwithstanding any other provision of law, a vehicle may be equipped with off-road lamps for use as headlamps while the vehicle is operated or driven off of a highway. The lamps shall be:
1. Mounted at a height of not less than forty-two (42) inches from the ground;
2. Wired independently of all other lighting; and
3. Turned off whenever the vehicle is operated or driven upon a highway.
H. 1. A motor vehicle may be equipped with not to exceed two daytime running lamps which conform to 49 C.F.R., Section 571.108, S5.5.11.
2. Daytime running lamps shall not be used in substitution of headlamps.
3. Daytime running lamps shall be mounted on the front of a motor vehicle and shall be wired to be:
a. automatically activated when the vehicle is started, and
b. automatically deactivated when the headlamp control is in any "on" position.
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