Washington Revised Code Title 46. Motor Vehicles § 46.37.150. Lamps on vehicles--Parked or stopped vehicles, lighting requirements

(1) Every vehicle shall be equipped with one or more lamps, which, when lighted, shall display a white or amber light visible from a distance of one thousand feet to the front of the vehicle, and a red light visible from a distance of one thousand feet to the rear of the vehicle. The location of said lamp or lamps shall always be such that at least one lamp or combination of lamps meeting the requirements of this section is installed as near as practicable to the side of the vehicle which is closest to passing traffic.

(2) Whenever a vehicle is lawfully parked upon a street or highway during the hours between a half hour after sunset and a half hour before sunrise and in the event there is sufficient light to reveal any person or object within a distance of one thousand feet upon such street or highway, no lights need be displayed upon such parked vehicle.

(3) Whenever a vehicle is parked or stopped upon a roadway or shoulder adjacent thereto, outside an incorporated city or town, whether attended or unattended, during the hours between a half hour after sunset and a half hour before sunrise and there is insufficient light to reveal any person or object within a distance of one thousand feet upon such highway, such vehicle so parked or stopped shall be equipped with and shall display lamps meeting the requirements of subsection (1) of this section.

(4) Any lighted head lamps upon a parked vehicle shall be depressed or dimmed.