Visibility

RCW 46.37.020

When lighted lamps and signaling devices are required.

Every vehicle upon a highway within this state at any time from a half hour after sunset to a half hour before sunrise and 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 feet ahead shall display lighted headlights, other lights, and illuminating devices as hereinafter respectively required for different classes of vehicles, subject to exceptions with respect to parked vehicles, and such stop lights, turn signals, and other signaling devices shall be lighted as prescribed for the use of such devices.

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