1 低噪音路面混凝土车辆行驶的噪声主要来源于发动机噪声、轮胎与路面之间产生的噪声及在行驶速度很快时产生的空气声。据调查,虽然车辆行驶速度不同,噪声大小有差异,但对于小型卡车来说,发动机噪声一般占65%左右,大型卡车占50%左右,小轿车占20%。空气声对于小轿车或低速行驶的小型卡车来说较小。因此,除了发动 A low noise road Concrete noise driving vehicles mainly from the engine noise, noise generated between the tire and the road surface and air speed generated when the sound is fast. According to the survey, although the vehicles have different speeds and different noise levels, the average engine noise is about 65% for small trucks, about 50% for large trucks and 20% for cars. The sound of air is less for cars or smaller trucks traveling at low speeds. Therefore, in addition to launch