When I was a kid, I had a mild obsession with traffic lights. I built models of them with my lego blocks. I dreamed that they were controlled by people who lived in the electrical boxes at each intersection, who had to shout at each other to stay in sync. I also sketched top-down drawings of roads and intersections.
As an adult, I still find traffic control interesting and I loathe inefficient intersections. The computer scientist in me knows that these things could still be much further improved.
I took the above picture a couple years ago in New Orleans.