This is an interpolation of travel times for teams based off numbers pulled form OpenStreetMap. There are no where near enough points to run an interpolation in this manner (only 56, and clustered at that!). This is (a close representation of) an Isochrone map. I hope to do more with this concept in the future, but it should be applicable to this thread: https://www.chiefdelphi.com/forums/showthread.php?t=166567
and this thread: https://www.chiefdelphi.com/forums/showthread.php?t=166770
Since it is so hastily put together, please try to refrain from any real analysis, the concept has a long way to go and a significant bump in potential quality and further analysis. This only exists to illustrate a concept, the US interstate system is included for you speculation pleasure.