Travel Time Contour Map

Ever wonder how far you could get from your house if you drove for eight hours in any direction? I have, so I made up this google map of concentric rings of travel time from my house (and, no, it's not as time intensive as it looks). Obviously the resolution drops off as the rings get bigger and it's only roads inside the rings that obey the time restrictions, not locations off of the streets. This leads to some pretty big areas in Quebec that are included even though they could never be reached, as google maps screens out smaller roads at lower zoom levels. They really ought to continue to show roads in sparse areas. I don't really care if a road is minor if it's the only way to get to someplace! It's just a way to avoid visual clutter, after all.