Get the full article here. Several citizens including Walter Scott and Paul Demitriades have been pressing the state to take the latest in sound dampening technology seriously.
The final environmental study for the Interstate 90 bridge project will not include rubberized pavement as a part of the plan, but the Department of Transportation (DOT) has agreed to do a separate study on the rubberized asphalt for both the Highway 520 and I-90 bridges.
As said in the article:
Rubberized asphalt is a combination of hot paving asphalt and recycled rubber-tire particles. It's been used in California, Texas, Canada and Belgium. In Phoenix, the metropolitan area's freeway system is being almost entirely repaved with the material.
Studies show it reduces freeway noise levels and has been cheaper or similar in cost to regular asphalt.