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3. Fundamentals of Traffic Noise <br />3.8.4. Shielding by Natural or Human -Made Features <br />A large object or barrier in the path between a noise source and a receptor can <br />substantially attenuate noise levels at the receptor. The amount of attenuation <br />provided by shielding depends on the size of the object and the frequency content of <br />the noise source. Natural terrain features (e.g., hills and dense woods) and human - <br />made features (e.g., buildings and walls) can substantially reduce noise levels. <br />Walls are often constructed between a source and a receptor specifically to reduce <br />noise. A barrier that breaks the line of sight between a source and a receptor will <br />typically result in at least 5 dB of noise reduction. Taller barriers provide increased <br />noise reduction. Vegetation between a highway and a receptor is rarely effective in <br />reducing noise because it does not create a solid barrier. <br />16 Fairview Street Improvements from 9th Street to 16th Street <br />and Bridge Replacement Project Noise Study Report <br />