Prohibits a sign subject to chapter 47.42 RCW (highway advertising control act--scenic vistas act), or any other sign that is visible from a highway that is under the jurisdiction of the state, a county, or a city, from being constructed as, or converted, enhanced, improved, modified, modernized, or altered into, a digital advertising sign.

Prohibits an official highway changeable message sign from being constructed as, or enhanced, upgraded, improved, modified, modernized, or altered into, a digital advertising sign for the purpose of displaying commercial messages in addition to official traffic operations or public safety messages.

Prescribes penalties.

Expires January 1, 2012.