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Volume 127, Issue 1, January 2010
- NOISE: ITS EFFECTS AND CONTROL 
127(2010); http://dx.doi.org/10.1121/1.3257229View Description Hide Description
Traffic noise, produced by moving vehicles, is described in terms of the day-night average sound level and the day-evening-night level . Both levels depend on the path of noise sources, such as road vehicles or aircraft. Usually, noise source path is rectilinear. Substituting a circle arc of radius for the straight path segment yields noise reduction . Assuming that noise propagation is governed by geometrical spreading, air absorption, and ground effect, relationship between and is derived. For example, replacement of a straight road at the distance of 100 m with the road of radius and the angle yields the noise reduction of 4 dB. In the case of road traffic noise, the presented results seem to be a viable alternative to barrier construction.