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How does the height of the noise barrier affect its noise reduction capabilities?

April 26, 2017affect barrier height noise reduction

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How does the height of the noise barrier affect its noise reduction capabilities?

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Typically a 5-decibel reduction in noise can be expected for a noise barrier that blocks the line of sight to the roadway. An additional 1.5-decibel reduction typically can be expected for each additional 40 inches (1 m) of barrier height above the line of site.