Abstract
In this report, in the begining, the acoustical powers and spectrums of running traffics on the street roads were measured, and then the nature of average street noise levels which were composed of many traffic noises were investigated. In the investigation, the relation between the street noise level and the number of running traffics were examined. Finally, the street noise level attenuation by distance from the street road were analized and the theo-retical nature of attenuation were compared with the measured street noise level at the windows of high-storied building, and then it was concluded that a street road would be regarded as if it was a infinit long belt type accumulation of many point sources.
