title: Map of all points below a certain time of travel?
body: <p>My question is very simple and can be understood in one line:</p>
  
  <p>Is there a way, tool, etc. using Google Maps to get an overlay of all surface which is below a certain time of travel?</p>
  
  <p>I hope the question is clear, but I coulnd't find anything related on the web.</p>
  
  <p>If you have any information, I'll take it!</p>
  
  <p>Here is what I mean illustrated by an example:</p>
  
  <p>I search for a new place to live. I know the precise address of my office.
  I would in this case be able to overlay on Google Maps the surface which is under a certain time of travel (let's say 30 minuts by car).
  We would have a long surface colored around motorways (because you get faster), and colors around roads.</p>