# What was my speed?

I recently got fined £60 with 3 points on my licence for doing 36mph in a 30mph zone. I did ask for the Gatso certificate of calibration, which I received with photos showing the car's position half a second apart.

Now at the time I 'bit the bullet' and paid the fine, but recently I got the photos out again to try and work out the speed for myself.

They show that in half a second the car moved the space of 4 white painted marks plus maybe another one or two feet, but no more than an extra two feet. I used the position of the base of the nearside back tyre, where it touches the road, as my reference points. The space between the white marks are five feet, so I estimate my car travelled 22 feet in that half a second.

I now know that to convert feet per second to mph the figure has to be multiplied by 0.6818. This means that to convert the feet per half second then that figure would need to be multiplied by 1.3636.

These calculations shows my car was travelling at 29.999 mph!

A couple of questions. Do you agree with my answer? If so, what can I do to rectify matters?

I did ring the police where it occurred, only to be told that because I paid the fine, I admitted the alleged offence and there was nothing I could now do, but a solicitor could act on my behalf! It wasn't just the fine that annoys me, there's also the 3 points on my licence, and also the fact for the next 3 years I now have to pay increased car insurance.

09:59 Fri 23rd Oct 2009

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