Yeah, it actually does need to be said. Folks with an investment in expanding highway infrastructure like to act as though the only way to relieve congestion is to build more roads for those cars to ride on. But a soon-to-be-published study shows that traffic expands to fill the space allotted. More roads don't mean more room -- they mean more cars. There are a few reasons for this, but mainly it's that people drive more when it's easier. It's not that we need to have a certain number of cars on the road, and that number just happens to …
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