Whilst travelling on the A3 near the M25 (junction10) in Surrey I went past three cameras positioned on the bridge in line with each of the three lanes. I had been travelling at around 85 to 90mph, but I saw a police car coming in the distance behind me and had slowed down. My question is does anyone know from how far away these things are likely to 'get' you? I know I should not have been speeding, but just wondered if anyone knew. The most strange thing was the police car. A platinum grey Seat Leon Cupra R and it was travelling at a speed of at least 120 -130mph. That's a new type of police car!