(a) Whenever a motor vehicle is being operated on a highway or shoulder adjacent thereto during the period from one (1) hour after sunset to one (1) hour before sunrise, and at any other time when there is not sufficient light to render persons and vehicles clearly discernable on the highway at a distance of at least five hundred (500) feet ahead, the operator of such vehicle shall use a distribution of light or composite beam directed high enough and of sufficient intensity to reveal persons and vehicles at a safe distance in advance of the vehicle, subject to the requirements and limitations hereinafter stated.

(b) Whenever the operator of a vehicle approaches an oncoming vehicle within a distance of five hundred (500) feet, such operator shall depress, dim or use a distribution of light or composite beam so aimed and directed that the glaring rays of such lights are not projected into the eyes of the operator of the oncoming vehicle, and in no case shall the high intensity portion which is projected to the left of the prolongation of the extreme left side of the vehicle be aimed higher than the center of the lamp from which it comes at a distance of twenty-five (25) feet ahead, and in no case higher than a level of forty-two (42) inches above the level upon which the vehicle stands, at a distance of seventy- five (75) feet ahead.

SOURCE: GC § 23141, enacted by P.L. 1-088 (Nov. 29, 1952).