Highway traffic noise analysis depending on varying vehicle types, surface textures, and vehicle speeds.

A highway traffic noise prediction model has been developed for environmental assessment in South Korea. The model was based on an outdoor sound propagation method fully compliant with ISO 9613 and the sound power level estimation for a road segment suggested in ASJ Model-1998. Due to two-pavement-type selection such as asphalt or concrete pavement in the model, the unacceptable prediction of traffic noise occurs in some cases when the road surface is different from that on which the model is based. In order to address this problem, eight pavement surface types were classified and the sound power level (PWL) of each surface type was determined and modelled by measuring the noise level based on both close proximity (CPX) and pass-by methods. The results show that traffic noise levels vary over a wide range as the variability of surface type, vehicle type, and vehicle speed. (a) For the covering entry of this conference, please see ITRD abstract no. E214938.