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Teehnical lnformation for Noise Wall Presentation <br />"Highway trafCic noise barriers: <br />• can reduce the Joudness of traffic noise by as much as half; <br />• da not completely blac[� a]l traffic noise; <br />• can be effective, regardless of the material used; <br />• must be tai.� and long witl� no openings; <br />• are most e%fectrve ►vitltrir 61 meters (�00 feet) of rr ltig/rway (usur�lty tlte first rnw of ho�res); <br />o must be designed to be visually appealrng; <br />o must be designed to preser�e aesthetrc values and scenic vistas; <br />• da not increase i�oise leve�s perceptibly on the opposite side oia highway; and <br />o subsiantially reduce noise levels for peaple living next Eo highways: " <br />htip: //tiv�vw,,fhwa. dot. gov/environna ent/keepdowrt. hi�r� <br />"Sound reducfio� by distan.ce <br />Sound spreading in opeEl air and measured at a certain dis€ance from the source is reduced by about 6 dB <br />for each doubling of that distance. Sound is redu.ced less when spreading inside a room." <br />htt ://wls�iv.barr�hrll.o�• .zrk/tis�ind arm/rrolse/hasics/NOISE%2000NTROL.htrr� <br />"Noise barriers are: <br />Most effective within 61 meters (200 feet) a�' a highway {usually the tirst row of homes}" <br />htt ://�vivivvir rniadot.or / ro�ects/ r-nolse-�valls-aboul_us <br />"Distance <br />Typically, a barrier is more effective the closer it is ta the source or ta the receiver. Noise barriers are <br />generally only effective for hornes within 300 ft. oithe roadway." <br />http://wtivw. tra�cnaise. a�-�/ <br />Shadow Effect of Noise Barrier <br />The lower house is proEected by the barrier, but the upper ane is not. <br />U�shr�ltie� Ft�US� <br />S1rJ���fed N�.r,�� ��rds� IIarrr�r <br />it�tiviv;{hiva. �lot.gov/environnsent/h.tnorse, htm <br />