I was doing about 80 last night in a 60 limit (about 4.00am) on wet roads etc in my work van and a car came from nowhere behind very quickly. I was worried it may have been pigs but it had a headlight out so figured it wouldnt be. I carried on cutting corners and crossing solid white lines for about a mile or 2 until I turned off, when I did I realised it was the cops behind me, but they didnt bother and just carried on going straight on