| http://www.w3.org/ns/prov#value | - Earthen berms work the best and are the least expensive, but a lack of available right of way usually makes concrete walls the most practical solution.WSDOT also uses temporary noise shields made from wood and closed cell foam, or other materials, to reduce noise from some types of construction equipment.Q. Does the public have any input?A. The WSDOT design office will work closely with the impact
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