It's a quicker fix than you'd think in the central areas of most American cities. In Austin, the neighborhood next to the University of Texas (enrollment: ~50,000) was drastically underzoned for decades. Within five years of its rezoning, the neighborhood changed drastically. I'd estimate that the neighborhood has about doubled in density in half a decade, and there's still plenty of land that will be redeveloped in the next decade.<p>Most suburbs will never be easy to serve with high quality transit, but most central cities could do it fairly quickly with the stroke of a pen.<p><a href="http://www.austinchronicle.com/gyrobase/Issue/column?oid=oid:193942" rel="nofollow">http://www.austinchronicle.com/gyrobase/Issue/column?oid=oid...</a>