TITLE 9: VEHICLE CODE
DIVISION 5: RULES OF THE ROAD
§ 5806. Lights. (a) Whenever a motor vehicle is operated on a highway or adjacent shoulder during the period from sunset to sunrise, or at any other time when there is not sufficient light to render persons and vehicles clearly discernible on the highway at a distance of at least 500 feet ahead, the operator of the 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 500 feet, the operator shall depress, dim or use a distribution of light or composite beam so aimed and directed that the glaring rays of the lights are not projected into the eyes of the operator of the oncoming vehicle. 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 25 feet ahead, and in no case higher than a level of 42 inches above the level upon which the vehicle stands, at a distance of 75 feet ahead. Source: PL 3-61, § 1 (§ 566).