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Why does Mn/DOT build noise walls?

build DOT mn noise walls
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Why does Mn/DOT build noise walls?

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A. In 1976, the U.S. Congress passed legislation requiring the states to provide mitigation for highway noise (considered an environmental impact) as a part of all Type I Federal Aid projects at impacted locations where it was found to be reasonable and feasible. Mn/DOT also builds noise walls for Type II projects, which are ranked in priority by the Minnesota Highway Noise Priority Study, directed by the Minnesota Legislature.

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