Isochrones, baby.
From the KC area, I can attest to the fact that traffic here is the easiest I've ever experienced anywhere. When I visited friends in Chicago I was floored when I learned that the 20-ish mile drive from downtown to the suburb we were headed to could take at least three hours. Going from La Guardia Airport to a different part of Lawn Guyland was a nightmare, and that was midday. Things like this make me appreciate that my daily 35 mile, ~40 minute commute one way is not anywhere as bad as it could be.
Living in Atlanta (top left map), I am a bit skeptical. This map says you can get all the way to Cumming in an hour. Maybe there is a way, but I've done that drive, and it's taken me half an hour just to get to 400 before. Maybe this map is accurate if you start on the interstate, but even then, I'm highly skeptical you can drive 50 miles at 4PM on a Friday. I mean, it says you can go west and get to the edge of the state in an hour! I've went that direction in rush hour too, and it took me an hour to get a third of that distance.
I'd love to see this centered around my office which is not downtown. I'm southeast of town, and the areas I'd most like to live are north (near the Wisconsin River) or west (in the driftless area). Traffic in both directions can be congested.
Once upon a time ArcGIS had a demo page where you could output a .kml with the proper inputs. I used the shit out of it for our business plan. Thing of it is, that doesn't allow you to account for traffic; they likely did some serious Google Maps abuse on that one.
While nothing beats the ease of uploading a kml, there are now a bunch of APIs offering lots of awesome mapping services on demand. Esri offers it in-app but has a positively stupid method of payment, WSJ uses HERE's Routing API, and I'm currently experimenting with Mapzen Flex which has a ton of cool services for next to nothing. The thing about drive time data is that it is averaged from user GPS data, with usually only a binary 'traffic yes/no' as a variable to take into account - if you click on the HERE link you can see it doesn't give you many options. Might even be averaged over all days (including weekends) if HERE was particularly lazy. Edit: Oh, by the by, Mapzen offers an Explorer where you can generate some isochrones as well. rthomas6, how accurate is it if you zoom out?