The Road Network Isodistance Map is a Google Maps based experiment which shows the extent you can travel by road within a specified distance of a given location. If you enter a distance to travel and right click on the map to set the location the extent you can travel from that point on any road is shaded on the map in green.
The routing comes from OpenStreetMap and only works for Austin. Therefore if you click on the map outside of Austin you won't see any results.
You can also view isochrone maps for a number of locations at Travel Time (for a number of US cities) or Mapnificent ( major cities around the world).
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