Since I left quite late today, even for me, around 2am, I was curious about how much traffic I'd see.
When I lived in Cheltenham, at 2am on a Monday night/Tuesday morning, you'd be lucky to see any moving traffic. Probably less than half a dozen vehicles would be busy, and several of those would be police cars!
In London, over a bit less than an hour, I saw 89 motor vehicles, 5 cyclists, and 10 pedestrians. That was actually more motor vehicles than I expected.