Washington Revised Code Title 46. Motor Vehicles § 46.61.125. Further limitations on driving to left of center of roadway

(a) When approaching or upon the crest of a grade or a curve in the highway where the driver's view is obstructed within such distance as to create a hazard in the event other traffic might approach from the opposite direction;

(b) When approaching within one hundred feet of or traversing any intersection or railroad grade crossing;

(c) When the view is obstructed upon approaching within one hundred feet of any bridge, viaduct or tunnel;

(d) When a bicycle or pedestrian is within view of the driver and is approaching from the opposite direction, or is present, in the roadway, shoulder, or bicycle lane within a distance unsafe to the bicyclist or pedestrian due to the width or condition of the roadway, shoulder, or bicycle lane.