itschampionman wrote:
MrsMiggins wrote:
I'm watching 'Bike Cops' on Men and Motors and they are performing speed checks on the road near a village. From the footage they appear to be watching the oncoming vehicles and then targetting them using the gun. So far, so good. However, the program showed plenty of this but no drivers being stopped at all. So the question is this - does this show that:
a) the cops are rubbish at estimating the speed of vehicles since no-one they measured with the gun was speeding
b) the cops were targeting almost everything that moved regardless of whether or not the vehicle, in their expert opinion, was speeding
c) the program makers didn't want to show anyone being stopped (this seems unlikely to me, particularly since the cops have just noted that it was a 'quiet' day)
What's the big deal at being able to estimate speed?
All the cop has to do is to time the vehicle between 2 objects before making the measurement.
On a site just mark up 2 objects, measure the distance between and time the vehicle. If going between the 2 objects in less than a certain time, pull trigger, job done.
Its hardly rocket science folks and what magistrate would throw that one out????
As I understand it, the requirement for a "prior opinion" as primary evidence is to counter the inevitable fallibility of any method of speed measurement. However it's calibrated the radar gun (or whatever) might give an erroneous reading at any point, and the legal way to cover this possibility is that it is only used to corroborate the expert judgement of the operator, who has already estimated the speed of the vehicle with a reasonable degree of accuracy. If both methods agree then the evidence is good enough to support a prosecution, if they don't (or only one method is employed) then it's not.
So if only (say) one out of ten cars targetted by the operator is actually speeding, then it would be fair to say that either his judgement of which approaching vehicles are speeding is hopelessly inaccurate, or he is making no attempt to make a judgement of their speed.
Thus his evidence of speeding cannot be relied on, and so the sole piece of evidence put forward is the reading of the speed trap. I am not a lawyer, but I believe this in itself is not sufficient evidence for a prosecution, for the reasons outlined above.
The example of mentally timing vehicles between two points would I imagine be a perfectly acceptable way of forming a prior judgement of vehicle speed. This would be clearly demonstrated by a very high "hit-rate" of speed trap measurements, as the Officer would then only be targetting vehicles that were clearly speeding.
But this was not the case in the example given.