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How much will the noise levels change after a noise wall has been built and will the change be noticeable?

April 26, 2017built levels noise noticeable wall

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How much will the noise levels change after a noise wall has been built and will the change be noticeable?

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The reduction in noise levels depends on the separation distance and elevation difference between the receptor and the noise wall. IDOT’s goal is to achieve at least an 8-dBA traffic noise reduction, which is considered a substantial noise reduction. For a receptor to be considered “benefited,” at least a 5-dBA reduction will occur. Changes in noise levels greater than 5 dBA are readily perceived by humans.