RCW 46.37.523: Motorcycles and motor-driven cycles—Head lamps.

(1) Every motorcycle and every motor-driven cycle shall be equipped with at least one lamp which shall comply with the requirements and limitations of this section.

(2) Every head lamp upon every motorcycle and motor-driven cycle shall be located at a height of not more than fifty-four inches nor less than twenty-four inches to be measured as set forth in RCW 46.37.030(2).

(3) Every motorcycle other than a motor-driven cycle shall be equipped with multiple-beam road-lighting equipment.

(4) Such equipment shall:

(a) Reveal persons and vehicles at a distance of at least three hundred feet ahead when the uppermost distribution of light is selected;

(b) Reveal persons and vehicles at a distance of at least one hundred fifty feet ahead when the lowermost distribution of light is selected, and on a straight, level road under any condition of loading none of the high intensity portion of the beam shall be directed to strike the eyes of an approaching driver.