El Deano:
[sThe latter are linked ANPR cameras set up measured distances apart. They record the time your number plate passes camera one and the time it passes camera two. They calculate your average speed on the time taken from one to the other, and if you do it too quickly they issue a ticket automatically.
I have also heard that they can clock you average between camera 1 and 6 or 2 and 7 for example.
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Indeed they can. They used to be really crude: ie only the cameras for each lane were linked, and you could fool the system by switching lanes before you got into the shot of the second camera, but that doesn’t work any more.