Washington Revised Code Title 47. Public Highways and Transportation § 47.36.080. Signs at railroad crossings

Wherever it is considered necessary or convenient the department may erect approach and warning signs upon the approach of any state highway to a highway-railroad grade crossing situated at a sufficient distance therefrom to make the warning effective. The department may further provide such additional or other highway-railroad grade crossing markings as may be considered to serve the interests of highway safety.