Paddywack
Free Member
The thing about being booked for speeding is that the reading they use is never the true speed of the vehicle, ....
Visualise a triangle of vectors , path of vehicle as A.
Right angle from the path is B
and the hypotenuse is C.
The hypotenuse C is always greater than the the path of the vehicle A and depends on the distance from the centre of the path of that vehicle path A to the point at which it was taken which is distance B
Simple maths gives the difference, If B is significant ie three lanes of a dual carriageway and the reading taken at a short distance the greater the error. It could make a LOT OF DIFFERENCE to a court case if the magistrates are not too stupid to understand the theory and the speed quoted by the Police not a deal over the limit.
Sorry simply not true, well the basic trigonometry, is but not in the circumstances you outline. The speed "trap" is using a measuring device utilising radio waves at phenomenal speeds in relation to the distances measured over, the time it takes for the bounce to produce the doppler effect at these speeds will not be very different in the case you outline above.