some thing like that, what they said was because the amber had been on for X secs then i should of stopped, fair enough i hold my hands up to that, the car behind me prob could not of stopped if i had done suddenly, and the grief of someone going in the back of me was not worth it, one thing to remember though there are no camera's facing behind my van, so it is your word against there's!!!! you'll lose.
as for the maths part that is what the electronics in the camera do with elapsed time and speed and distance, they had me good.
thinking about it though now, whilst typing this it would of been better to let the guy go up my arse and then claim compensation and whiplash and a new van, oh well the astra will do for now.
richie