Question

Highway sound
keep highway noise away from neighborhoods. They are made from wood, metal, or
.


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Answers

GPT-4o mini
It seems you're looking for materials often used in sound barriers along highways. In addition to wood and metal, sound barriers are also commonly made from:

- **Concrete**: A durable and effective material for sound barriers, concrete walls can significantly reduce noise pollution.
- **Plastic or Composite Materials**: Often used for their lightweight properties and resistance to weathering, these materials can also be effective in sound reduction.
- **Earth**: Earth mounds or berms can naturally block sound waves and are often used in conjunction with other materials.

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