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Why traffic can't be solved with more highway lanes

Traffic and congestion have been worsening in American cities for decades. But the problem isn't so easy to solve. Experts point to these measures to help to ease traffic flow: wider roads and highways, more public transit and better urban design and planning. In recent years, some economists have been touting the solid benefits of varied congestion pricing that have worked to free up traffic in such cities as Singapore and London.
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