Abstract
In this paper, reduction of road traffic noise from an isolated vehicle starting from a tollbooth was investigated quantitatively, if a low-noise vehicle such as an electric one was used widely. Furthermore, it is assumed that sound power level of low-noise vehicles is equal to that of a gasoline car and a diesel truck coasting on a road. Two toll-booths in an expressway, each of which is located on different expressways, were chosen as the subject of study. The study indicated that spread of low-noise vehicles is very effective for reducing starting noise radiated from an isolated vehicle, that is, we can decrease truck noise by 10 dB or more, and also decrease car noise by 5dB or more.
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