| Keywords |
Traffic noise ; Traffic volume ; Vehicle speed ; Space headway ; Noise prediction |
| Abstract |
The purpose of this work is to investigate and analyze the influence of traffic volume and vehicle speed on the sound level (the equivalent continuos A-weighted sound pressure level) at a roadside. Six roads with various types such as urban freeway, national highway, urban road, and expressway were selected for measurements. The traffic conditions of domestic vehicles and the traffic noise were measured simultaneously by using the Smart-sensor with built-in dual radars and the precision sound level meters, respectively. 2,580 raw data including the traffic conditions and the sound level were collected. On the basis of these data, not only the characteristics of each traffic condition but the relationships between each traffic condition and the sound level were analyzed in detail. The result showed that the growth in sound level was considerable with increasing the traffic volumes in range of less than about 2,000 veh/hr. In addition, as the vehicle speed is closely related to the traffic volume, the sound level was affected by both traffic conditions at the same time. |