Somehow, I doubt that they have been placed there solely to monitor the speed of people driving down route 7. It would be interesting to determine if they are hardwired into a network of some kind, or if they transmit their footage over radio.
Not two hundred yards from the apartment in which George Orwell lived for most of his life, one can find thirty-two closed-circuit securicams watching the streets. Ostensibly for tracking down perpetrators of crimes, if asked to do so, British police forces are reluctant to do so given just cause...