As cities grow and populations expand, people move further and further away from the center. That's definitely happened in New York—and this visualization shows how the shift to more distant neighbourhoods affects travel time.

The interactive maps lets you click on a location and then gives a color-coded insight into transit times across the entire city. It's a little like Trulia's Google Maps mash up—in fact it almost certainly shares some data sources with it—though it collapses data down instead of giving results by transport type. And it looks prettier, too. [WNYC via Flowing Data]