The initial testing of noise control panels installed on the Interstate 5 Ship Canal Bridge in Seattle shows they are not reducing traffic sounds as much as expected.
The Seattle Daily Journal of Commerce reports recent tests found a reduction of only a decibel or two. Officials had expected a reduction of four or five decibels.
The Transportation Department had a contractor install 700 baffles under the highways upper deck at a cost of $2.3 million.
Some neighbors report a big reduction in noise, but others haven’t noticed any.