Very neat trick using computer speakers and the doppler effect to do surprisingly accurate motion tracking. Try it yourself in the browser (but be warned it’s not pleasant to listen to).
The MTA made an adorable 8-bit video to explain how they deal with subway delays.
I managed 85th percentile, which I think is pretty good for someone who didn’t grow up in the city.
Gridlock vs. Bottlenecks is a very cool interactive exploration of traffic dynamics and how traffic jams can sometimes emerge almost out of nowhere.