Washington Revised Code Title 46. Motor Vehicles § 46.61.200. Stop intersections other than arterial may be designated

In addition to the points of intersection of any public highway with any arterial public highway that is constituted by law or by any proper authorities of this state or any city or town of this state, the state department of transportation with respect to state highways, and the proper authorities with respect to any other public highways, have the power to determine and designate any particular intersection, or any particular highways, roads, or streets or portions thereof, at any intersection with which vehicles shall be required to stop before entering such intersection. Upon the determination and designation of such points at which vehicles will be required to come to a stop before entering the intersection, except as provided in RCW 46.61.190, the proper authorities so determining and designating shall cause to be posted and maintained proper signs of the standard design adopted by the state department of transportation indicating that the intersection has been so determined and designated and that vehicles entering it are required to stop, except as provided in RCW 46.61.190. It is unlawful for any person operating any vehicle when entering any intersection determined, designated, and bearing the required sign to fail and neglect to bring the vehicle to a complete stop before entering the intersection, except as provided in RCW 46.61.190.