Every urban highway overpass should have soundproofing and then shops underneath. They’re dead zones in cities and it doesn’t have to be that way.
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sounds like a great way to revitalize urban areas and make them more enjoyable to live in.
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One of the more feasible versions of this that's going around is converting them to tunnels and building the shops/housing at street level above it
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attempting to soundproof an armada of 80mph cars several dozen feet up is just impossible
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