Aside: Isochronic Maps

[IsoChrone Maps][] look a lot like what we now call “heat maps” in the current moment. (Hat tip to [Scott Weingart][] for the heads up.)

[IsoChrone Maps]: https://alternativetransport.wordpress.com/2015/05/07/what-is-an-isochrone-map/
[Scott Weingart]: http://www.scottbot.net/HIAL/?page_id=22226

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