Washington State Department of Transportation (WSDOT) responded to citizen complaints about expansion joint noise on the new Tacoma Narrows Bridge (TNB) by installing a new wall coated in noise absorptive materials. The goal of the project was to reduce low frequency noise from the bridge. The report highlights the collaborative process used to develop the project design, the methodology used to evaluate the project’s performance, and the project results. Lessons learned include suggestions for improving acoustic performance evaluation.
Washington (State) Dept. of Transportation. Northwest Region. Environmental and Engineering Programs
Noise control, Expansion joints, Bridge approaches, Traffic noise, Noise barriers, Walls, Sound attenuation, Panels, Coatings.