If you've ever wondered what it would be like to evacuate the city after an immediate impact cataclysmic event such as a terrorist attack or radiation leak, yesterday's evening commute provided as close an approximation as you can get without actually conducting a city wide drill which is, of course, logistically impossible. In fact, it is probably a better approximation than a drill.
Since this was indeed the case, I'm wondering if the city will be conducting any research into the traffic patterns that emerged last night because what happened yesterday would make an excellent test case for future evacuation planning.
The reason yesterday's commute would provide insight into how an actual emergency evacuation might look is that people don't simply head out of the city. They have loved ones, pets, and even valuables that they simply will not leave without. That will create the sort of cross-town clusterfuck like we experienced last night. It's worth looking into.