11.63.080 - FORBIDDEN DEVICES - PENALTY (RCW 47.36.180)
It shall be unlawful to erect or maintain at or near a city street, county road or state highway any structure, sign, or device A. Visible from a city street, county road or state highway and simulating any directional, warning, or danger sign or light likely to be mistaken for such a sign or bearing any such words as "danger", "stop", "slow", "turn", or similar words, figures, or directions likely to be construed as giving warning to traffic;