Answer: it is intended for sound insulation.
The noise barrier is also called a noise barrier or an acoustic barrier. The noise barrier is a solid wall whose function is the acoustic insulation of its environment. This wall must reduce or cancel noise pollution. In general, noise barriers are found along infrastructures located near dwellings. These infrastructures which generate a lot of noise capable of disturbing the neighborhood are mainly highways, peripherals, railways or even particularly noisy airports or industrial areas. These walls are generally imposing, about ten meters in height more or less. They are made of concrete, but we can also protect homes from noise by "walls" of vegetated earth much more aesthetic than the usual concrete walls. Some of these walls are temporary, the time of a site, for example. You too, send us your brico question