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Noise Wall Overhang Design [Factsheet]
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2019-04-01
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[PDF-312.96 KB]
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Abstract:One potential option to achieve noise reduction at a lower cost is to add a roadway-side overhang component to the top of an existing or proposed noise wall. Broadly, a noise wall “overhang” modification is an additional structural element or fixture attached along the top edge of a traditional or “plain-top” noise wall. The acoustical benefit of an overhang is that the distance traveled between the traffic noise source and a listener behind the wall is increased relative to a traditional plain top wall. Most applications of noise wall overhang designs are characterized by the shape that is assumed by the wall’s cross-section after the modification is deployed. For example, an overhang design in which the overhang is at a 90° angle with respect to the vertical wall face is known as a “T-Top” noise barrier while any overhang with an angle between 0° and 90° is termed a “Y-Top” noise barrier.
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