摘要 : A model of highway traffic noise if formulated based on vehicle types. The data were collected from local highways in Thailand with free-flow traffic conditions. First, data on vehicle noise was collected from in- dividual vehicle... 展开 A model of highway traffic noise if formulated based on vehicle types. The data were collected from local highways in Thailand with free-flow traffic conditions. First, data on vehicle noise was collected from in- dividual vehicles using sound level meters placed at a reference distance. Simultaneously, measurements were made of vehicles' spot speeds. Secondly, are data for building the highway traffic noise model. This consists of traffic noise levels, traffic volumes by vehicle classification, average spot speeds by vehicle type, and the geometric dimension of highway sections. 收起