Damian Erwin

Damian Erwin

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Damian Erwin
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Figure illustrating that a noise barrier achieves 5 dB of noise reduction, when it is tall enough to break the line-of-sight from the source to the receiver, and 1.5 dB of additional attenuation for each additional 1 m of height above the line-of-sight from www.fhwa.dot.gov

Figure illustrating that a noise barrier achieves 5 dB of noise reduction, when it is tall enough to break the line-of-sight from the source to the receiver, and dB of additional attenuation for each additional 1 m of height above the line-of-sight