Traffic Control Signs on Washington state highways help contribute to the orderly and predictable movement of traffic. Three types of signs, Regulatory Signs, Motorist Information Signs, and Warning Signs provide uniformity, guidance and safety for all elements of the traveling public including vehicular traffic, pedestrian traffic, and bicycle traffic.
Uniform standards for the application of traffic control signs are contained in a publication of the U.S. Department of Transportation, the Manual on Uniform Traffic Control Devices (MUTCD). The MUTCD has been adopted as the statewide standard for traffic control devices, through Chapter 468-95 of the Washington Administrative Code, as mandated by RCW 47.36.030.
The Sign Fabrication Manual contains fabrication information for most traffic control signs currently used in Washington state. The manual includes signs contained in the Federal Standard Highway Signs Book and additional signs approved for use within the state of Washington.