Traf Pol with a hand held camera.....?
Discussion
Family member told me today that he went past a Traf Pol with a speed camera....
[standing in a layby]
60mph limit....possible speed up to 69 - definitely not 70.
What are the tolerences here [of both the device and the operator] ?
What is the likelyhood of points and a fine for this ?
Any other info?
Yeah, they need a load of gear to issue FPN's (video recorder et al).
The tolerences are typically limit + 10% + 2mph, so 68mph. It's because the officer has to "form a prior opinion of excess speed" before using the gun to confirm it. So in practice they use that margin so it would be difficult to contest that the victim was obviously speeding.
The guns are very acurate, despite what you might read in the Daily Hate and other tabloid rags. Car speedo's, however, are generally not acurate and over-read. So it's probably they were only doing 65mph-ish.
Besides which Trafpol (generally) don't try to stick the slightest infraction on anything that moves, they use common sense!
The tolerences are typically limit + 10% + 2mph, so 68mph. It's because the officer has to "form a prior opinion of excess speed" before using the gun to confirm it. So in practice they use that margin so it would be difficult to contest that the victim was obviously speeding.
The guns are very acurate, despite what you might read in the Daily Hate and other tabloid rags. Car speedo's, however, are generally not acurate and over-read. So it's probably they were only doing 65mph-ish.
Besides which Trafpol (generally) don't try to stick the slightest infraction on anything that moves, they use common sense!
Good...
He's a very good and safe driver, and recently got his only ever 3 points after 40 years of driving
[Scamera hidden in a hedge in a country lane...]
He drives at fairly low speeds most of the time - and on this particular journey was passed by several much faster drivers...hence is rather bitter..
He's a very good and safe driver, and recently got his only ever 3 points after 40 years of driving
[Scamera hidden in a hedge in a country lane...]
He drives at fairly low speeds most of the time - and on this particular journey was passed by several much faster drivers...hence is rather bitter..
Andrew D said:
Yeah, they need a load of gear to issue FPN's (video recorder et al).
The tolerences are typically limit + 10% + 2mph, so 68mph. It's because the officer has to "form a prior opinion of excess speed" before using the gun to confirm it. So in practice they use that margin so it would be difficult to contest that the victim was obviously speeding.
The guns are very acurate, despite what you might read in the Daily Hate and other tabloid rags. Car speedo's, however, are generally not acurate and over-read. So it's probably they were only doing 65mph-ish.
Besides which Trafpol (generally) don't try to stick the slightest infraction on anything that moves, they use common sense!
The tolerences are typically limit + 10% + 2mph, so 68mph. It's because the officer has to "form a prior opinion of excess speed" before using the gun to confirm it. So in practice they use that margin so it would be difficult to contest that the victim was obviously speeding.
The guns are very acurate, despite what you might read in the Daily Hate and other tabloid rags. Car speedo's, however, are generally not acurate and over-read. So it's probably they were only doing 65mph-ish.
Besides which Trafpol (generally) don't try to stick the slightest infraction on anything that moves, they use common sense!
Cops up up here don't always form a prior opinion. They seem to gun everything that moves. How do I know? I knew that a cop with a laser was over the brow of a hill in a 30 limit so crawled over the crest at 25.
Off goes my Bel 980............."Laser Alert". No prior opinion there, or perhaps he was so clueless he could not judge my speed to be less than 30 by a big margin. This has happened more than once.
I have also seen them hiding behind their cars in contravention of the ACPO Code of Practice ( not guidelines ),foreworded by Brunstrom who says it must be followed to the letter
Andrew D said:
The guns are very acurate, despite what you might read in the Daily Hate and other tabloid rags.
If you are referring to Lidar guns (e.g. LTI 2020) then that’ll depend on your point of view.
Yes they can measure speed very accurately - but the speed of what?
It measures the rate of change of emitted light pulse flight times (and returned pulse width) - nothing more. Each pulse is bounced against a reflective surface but the equipment cannot know that the pulses are bounced from the same surface throughout the speed measurement. If the surface differs during the measurement in a manner resulting with a uniform rate of change of flight times, then a false speed reading will be achieved. This is called ‘slip’ and it’s an explainable and proven phenomenon.
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