Combatting lazy police in the uk

Hello, Steve here from England, please could someone help me? ( I am NOT mathematically knowledgeable by the way!)

I need to confirm that a maths formula will provide me with the correct data to combat a speeding problem in my road that the local police will do nothing about......

I need to prove that vehicles can accelerate and achieve high speeds within certain distances and that proof can be used to contradict a senior officers report.

so, I found D = Vo x T + 1/2 A x T xT and for example a car will achieve within 5 seconds a distance of 125ft, is that right?

I am using 10 for A ( 10ft/sec/sec ) and half that for motor cycles?

any help gratefully received, I would absoultely love to shove some mathematical data up his snotty nose, 'cos you just can't argue it!!

thanks in anticipation

Steve