Believe me, a year ago the camera closest to the roundabout was active 'cause I saw the flash as I went past and got the ticket later. As far as driving toward the pesky things - I got caught by the Beeston one and, because my car had been driven by three different drivers over that section, queried who could be summonsed. I got a lovely picture of me in the driver's seat for my pains and had to pay up. I think it used to be that the ones that caught the rear of the car could be in doubt as they were unable to prove who the driver was.