Why not devise a GoogleEarth feature that automatically calculates the perimeter you can reach from any given location, in a preset time. You would have a realtime view of the map with e.g. a 'half-hour perimeter', an 'hour perimeter'... for each vehicle or transport mode you have at your disposal.This would make eco-friendly decisions easier ! It would eliminate much of the time you spend filling in all sorts of transportation planners where you still have to figure out yourself which is the most convenient.
At traffic peak times you would be surprised to see the size of the 15' perimeter which is actually faster to reach by bicycle than by car!
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I think your idea might be fun as a one-time curiosity, but I can't imagine using it on a regular basis. Or making money from it.
Also, I think the 10-hour half-way trip prediction may be way-more interesting than the ten minute.
I don't think you mean to calculate the "perimeter", you actually mean to calculate the maximum travel, which would result in a perimeter. If it were a circle, the word would be radius (or radii), but I don't know if there's a word for the distance from center to the edge of an unusually shaped closed-curve.
Ironically, because of highways, in a certain amount of time you might be able to get to the next city, but not to a surburban shopping center on the other side of your own city. Your 'perimeter' might have lots of 'holes' in it because of slow-stoplight-traffic.
I'd insist on "horizon", which may be the correct scientific term, but "perimeter" gets the meaning across well enough. In any case, this would be an interesting concept.