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Originally published Sunday, August 16, 2009 at 10:58 AM

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State installing quieter highway in Bellevue

The Washington Department of Transportation is warning of construction backups on northbound Interstate 405 in Bellevue as crews install quieter asphalt pavement.

BELLEVUE, Wash. —

The Washington Department of Transportation is warning of construction backups on northbound Interstate 405 in Bellevue as crews install quieter asphalt pavement.

It's the third section of highway in the region where engineers are testing quieter pavement to reduce road noise.

Two previous sections - southbound Interstate 5 through Lynnwood and State Route 520 between Medina and Bellevue - haven't performed well.

Tom Baker, a WSDOT materials engineer, says any noise reduction from the quiet pavement was lost within the first six months after paving. Those sections are now just as loud as cheaper standard asphalt put in at the same time.

The agency says it is changing its methods and pavement mix for this test section.

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