It seems counterintuitive, but transportation studies have shown, and recent history has confirmed, that building more roads in dense urban areas actually increases traffic and congestion instead of reducing it. Want to relieve your urban core of congestion, gridlock and smog? Tear down the freeways.
Granted, here in L.A., as in most other Southwestern cities, this policy option is less needed since most of our highway systems predated development; they were simply "roads to nowhere" that eventually spurred suburbanization. But most cities east of the Mississippi---and particularly in the Northeast---saw once-virbant neighborhoods torn asunder with the coming of the Interstates, with the predictable accompaniments of increased blight and crime. Replace those highways with at-grade boulevards and parkways, you'll increase interurban mobility, reduce blight, reunite neighborhoods, incentivize the use of public transit,and improve local property values. Win-win! Now, there are plenty of grass-roots efforts across the country that are working to make these changes in their respective communities, but it would be nice to get an assist from some people in Washington. Tearing down freeways costs money, after all, and a lot of northeastern cities like Detroit and Buffalo, which would benefit greatly from losing their urban freeway networks, just don't have the resources. That's too bad because there's plenty of money to go around in Washington---we just need to change our policy priorities.
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Baron V