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Parallel Barrier Effectiveness Under Free-flowing Traffic Conditions

Gregg G. Fleming

出版	U.S. Department of Transportation, Federal Highway Administration, Office of Engineering and Highway Operations, Research and Development, 1992
URL	http://books.google.com.hk/books?id=CoRCFGCNf9wC&hl=&source=gbs_api

註釋

Presents the results of a measurement study performed at a highway noise barrier site located along Interstate 495 in Montgomery County, Maryland. The objective of the study was to measure the degradation in acoustic performance of a highway noise barrier due to the close proximity of a parallel barrier on the opposite side of the roadway. The test site selected for measurements consisted of a contiguous arrangement of two parallel reflective noise barriers followed by a single noise barrier. Five-minute, energy-averaged, A-weighted noise levels were computed from data measured simultaneously at identical heights and offset positions behind the single and parallel barrier arrangements. A comparison of the measured and predicted results is presented.