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Question:

In what circumstances the expressway needs to install a sound barrier

In what circumstances the expressway needs to install a sound barrier

Answer:

The meaning of the sound barrier installation is that the road passes through the residential area and is set to reduce the impact of noise on the surrounding residents
So the road through the residential areas have to install sound barrier
There is an area of influence on the design specification that you can look for How much to the specific number of you can find it!

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