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31 <br /> Attachment 7 <br /> Noise walls have been used to abate noise in many racetracks in recent years. Three <br /> examples are provided for discussion purposes. Like the examples of walls constructed <br /> along federal interstate highways, their intent is to dissipate noise volumes by blocking <br /> its direct path to the surrounding residences, reflecting the noise waves, and dissipating <br /> their energy levels. The upper left image is from a raceway facility in Concord, North <br /> Carolina. <br /> Some can be decorative and serve multiple functions. Viewing stands can act as a <br /> noise wall if they are of solid construction with no structural gaps. <br /> IT f <br /> a <br /> } <br /> a <br /> a3 <br />