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为解决高速公路中车辆往来行驶产生的噪音扰民问题,美国得克萨斯州州立大学的研究人员对高速公路旁的嗓音屏障(防噪音墙)进行改良,以降低噪音。据海外媒体报道,美国1972年立法规定,道路周围的噪音不得超过67分贝。此后,美有关部门在全国多条高速公路上兴建了总长1000多公里、高约3.6m的噪音屏障以降低嗓音。尽管每公里噪音屏
To tackle noise nuisance problems that occur when vehicles travel on freeways, researchers at Texas State University have modified the noise barrier (noise barrier) along the highway to reduce noise. According to overseas media reports, the U.S. legislation in 1972 stipulated that the noise around roads should not exceed 67 dB. Since then, the relevant departments of the United States have built a noise barrier of more than 1,000 kilometers and a height of about 3.6 meters on a number of highways throughout the country to reduce their voice. Despite the noise screen per kilometer