I guess some people have found more sustainable healthier ways of living inside a city:
"Bicycle Rush Hour Utrecht (Netherlands) III" -> http://www.youtube.com/watch?v=n-AbPav5E5M
"Bicycle Rush Hour Utrecht (Netherlands) III" -> http://www.youtube.com/watch?v=n-AbPav5E5M
Now try that in wide swaths of San Francisco: http://maps.google.com/maps?q=22nd+st+and+rhode+island+&...