PPT Slide

Noise Bern Analysis

4

Perceived Noise Reduction Benefits

• 10 dBA decrease perceived as 1/2 reduction

• 5 dBA decrease perceived as a noticeable reduction

• 3 dBA decrease would be just perceptible

• Noise berms or barriers are less effective for low frequency noise

• Noise berms or barriers do not address airborne sources of noise

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