Source: http://gizmodo.com/transit-times-in-nyc-visualized-752731586
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