It&#x27;s similar in Washington state. Signs on interstates are heavily regulated: <a href="http:&#x2F;&#x2F;www.wsdot.wa.gov&#x2F;NR&#x2F;rdonlyres&#x2F;653A31E9-ADE7-42CA-854E-8A2350338C20&#x2F;0&#x2F;AdSignFolio.pdf" rel="nofollow">http:&#x2F;&#x2F;www.wsdot.wa.gov&#x2F;NR&#x2F;rdonlyres&#x2F;653A31E9-ADE7-42CA-854E...</a>