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What would that city look like? Would that make you more likely to want to live there?
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How much of an impact do highways have on the environment?

How much of an impact do highways have on the environment?

Taken from the FHWA:
In the United States today, traffic and roads are strongly implicated in many of the major environmental problems: air and water pollution, heavy energy use, fragmented farmland and habitat, wildlife and biodiversity losses, and disruption of ecological communities
While they can help us travel, they do contribute to major pollution. However, they do have solutions for animals being separated, with building highway crossings, such as the one below.