Over at ThinkProgress, Matthew Yglesias explains why building freeways through cities was always a bad idea:
The reason is simply that the purpose of a highway is to make it easy to travel long distances in short periods of time. But the central fact about cities is that almost by definition they’re not far from downtown. When you build a freeway that leads from downtown, through residential areas, out to the suburbs what you’re doing is making it easier to get to stuff downtown without living in the city. If you replaced the freeway with a normal at-grade road, suddenly it would make more sense to live closer to downtown. The idea of urban freeway construction was to preserve the vitality of downtown areas at a time when more people wanted to move out to the suburbs. But trying to preserve downtown at the cost of eliminating your residential neighborhood’s core advantage — it’s easy to get downtown! — was fantastically short-sighted. Of course what’s done is done, and just because a highway shouldn’t have been built doesn’t necessarily mean it would make sense to tear it down. But oftentimes that’s exactly what it means!
The point is, urban freeways generally diminish urban vitality by devaluing the city's residential core. Some people are okay with that, but let's not pretend that urban freeways are anything but a gigantic subsidy of suburban communities at the expense of in-city residential neighborhoods.
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