It's not "a couple of hours work" though is it?You've not seen this junction. I saw the one collar and I didn't actually stop. During the course of a rush hour, I'd expect them to get around 100 if they managed to stop every RLJ. That's £8000 for a couple of hours work.
There are arrests, interviews, charges, CPS, solicitors, court appearances and all the rest, all multiplied by 100.