RCW 46.61.345: All vehicles must stop at certain railroad grade crossings.

The state department of transportation and local authorities within their respective jurisdictions are authorized to designate particularly dangerous highway grade crossings of railroads and to erect stop signs at those crossings. When such stop signs are erected the driver of any vehicle shall stop within fifty feet but not less than fifteen feet from the nearest rail of the railroad and shall proceed only upon exercising due care.