What regulations and policies apply to traffic noise?
At the federal level traffic noise is regulated under 43 CFR 772. The Washington state Noise Policy and Procedures – 2006 (pdf 234 kb) goes into more detail and incorporates state specific regulations. FHWA Traffic Noise website also has information on traffic noise, regulations, and modeling. Additional information on what is required in a noise study is available in the WSDOT Environmental Procedures Manual, Chapter 446 (pdf 648 KB) The complete Environmental Procedures Manual is also available online.