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They have them in a lot of European countries, we call it "the green wave".

There's also another trend on the rise: cameras that take photographs of license plates at an interval of several miles. If the calculated speed (the average) is larger than what's permitted you get a ticket.

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Yes, we have those in the UK called SPECS (http://en.wikipedia.org/wiki/SPECS_%28speed_camera%29) although these are generally (only in my experience) used temporarily in roadworks etc. which have a temporary lower speed limit.

I believe France did this the low-tech way in the past with toll roads (get a ticket with the time when you enter a toll road, pass it to the booth when you get off, S=D/T and caclulate if you have a speeding fine to pay as well)

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