Abstract
In the new environmental standard for road traffic noise, equivalent sound level was adopted instead of medium value. At the same time, the prediction model of road traffic noise was proposed by Acoustical Soc. of Japan. This model is utilized for the environmental assessment, and the application range is also wide. However, designers can not calculate easily the value of the road traffic noise using this model. Therefore, authors proposed the calculation method which satisfied two following requirements regardless of usual pavement, drainage pavement, though the application range is limited to the roadside noise as the automobile steadily runs.(1) Equivalent sound level can be easily calculated using mathematical expressions and figures.(2) Designers can easily decide noise reduction countermeasure of the object site.
