Abstract
The hourly traffic volume at night is typically lighter than that during the day. However, the average speed and the rate of heavy vehicle tend to be higher at night. It is shown that the influence of the maximum A-weighted sound pressure level (LA,Fmax) is much more dominant in the night than during the day in the roadside areas of a highway. In order to predict and evaluate the traffic noise in the areas facing the road and to investigate the influence on the health effects of the residents living in such areas, it is indispensable accurately to grasp not only the equivalent continuous A-weighted sound pressure level but also the LA,Fmax and the dynamic properties of level fluctuation of noise.
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