近些年随着我国城市化进程的加快,越来越多的高速道路系统在大城市和城郊结合部快速地延伸和扩展,其形式有高速公路、高架道路、地铁、轻轨道路等,而且城市交通正在向高等级、高速度、高架立体等现代化方向发展。道路发展为机动车数量急剧增加创造了条件,近年来交通噪声污染在城市中泛滥,一些城市俨然已淹没在滚滚车流之中。 In recent years, with the acceleration of the process of urbanization in our country, more and more high-speed road systems are rapidly extended and expanded in the joint of metropolitan and suburban areas in the form of highways, elevated roads, subways, light rail roads, etc., Traffic is to high-level, high-speed, elevated three-dimensional and other modern direction. Road development has created conditions for a drastic increase in the number of motor vehicles. In recent years, traffic noise pollution has spread in cities, and some cities have been submerged in rolling traffic.