随着城市交通的发展，立交桥、高架桥上过往车辆的噪音扰民问题越来越突出地摆在环境工作者面前。其实不仅道路交通存在噪音污染，在越来越流行的商店门前广场促销文艺演出的音响效果也往往超出商家所针对的顾客人群，对相邻的居民区造成噪音干扰。而交通信号灯的提示音、火车 With the development of urban transportation, the noise nuisance problem of passing vehicles on overpasses and viaducts has become increasingly prominent before environmentalists. In fact, not only is there noise pollution in road traffic, but also in the more popular shops in front of the square, the sound effects of theatrical performances are often beyond the customers targeted by the business, causing noise disturbance to the neighboring residential areas. The signal lights, trains, trains