声屏障，主要用于公路、高速公路、高架复合道路和其它噪声源的隔声降噪。分为纯隔声的反射型声屏障，和吸声与隔声相结合的复合型声屏障，后者是更为有效的隔声方法。指的是为减轻行车噪声对附近居民的影响而设置在铁路和公路侧旁的墙式构造物。隔音墙也称为声屏障。在声源和接收者之间插入一个设施，使声波传播有一个显著的附加衰减，从而减弱接收者所在的一定区域内的噪声影响，这样的设施就称为声屏障。分为交通隔音屏障、设备噪音衰减隔音屏障、工业厂界隔音屏障、公路和高速公路上是使用各类型声屏障最多的地方。
Noise barrier is mainly used for sound insulation and noise reduction of highways, expressways, elevated composite roads and other noise sources. It can be divided into pure sound insulation reflecting type sound barrier and composite sound barrier combining sound absorption and sound insulation. The latter is a more effective sound insulation method. It refers to the wall structure set beside railway and highway to reduce the impact of traffic noise on nearby residents. Sound barriers are also known as sound barriers. A facility is inserted between the sound source and the receiver, so that the sound wave propagation has a significant additional attenuation, so as to reduce the noise impact in a certain area where the receiver is located. Such a facility is called a sound barrier. It is divided into traffic noise barrier, equipment noise attenuation noise barrier, industrial factory boundary noise barrier, highway and highway, which are the most widely used noise barriers.