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@Sparky
I'm not focusing on anything. As I said, I was just mulling it over.
What I meant was that a speed camera is fixed in one spot and people learn where it is. So drivers slow down when they pass it, and that's it.
A distributed system is not like that. It works by preying on your mind and being too hard to trick. You could get photographed leaving home, miss all the cameras on the five miles to work, then get snapped as you pull into the car park. If you averaged 31mph, you'll get done. This is, perhaps, unlikely in London, where average speeds are lower. But you don't know you won't be caught. You can't be sure, so it works as a blanket deterrent.
See?