Isochrone maps show travel times from a given location. Most isochrone Google Maps allow the user to select a location and then see how far they can travel in a set time from that destination.
One of the best isochrone maps built with the Google Maps API is the
London at Night map.
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The London at Night map shows how long it takes to get to anywhere in London by night bus.
If you would like to create your own isochrone map then a good place to start is the Flying Memes tutorial. The Flying Memes isochrone map uses the directions service to search for points that surpass a given time limit from the given location.
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