This report documents the performance of the first Next Generation Concrete Surface (NGCS) built by the Washington State Department of Transportation (WSDOT). A 1,500 foot test section was installed on the eastbound lanes of I-82 near Sunnyside, WA in October of 2010. On-board sound intensity (OBSI) measurements increased from initial levels of 100.6 dBA to 104.4 dBA in 30 months. The increase in noise level was attributed to the loss of aggregate and general roughening of the concrete surface by studded tires.
It was concluded that the NGCS is not a viable option as a noise mitigation strategy for Washington State.