Plod laser accuracy
Discussion
Having seen one of these in use I can say that they're very very accurate. In fact, when you show a motorist just what it measures their jaws usually hit the ground. Mine did.
In answer to the other post, they can measure oncoming or passing vehicles. However, if I were to fit a jammer I would only fit it to the front. My theory being that you should have seen the officer with the gun by the time you pass him and have already slowed down
Hope this is of help.
In answer to the other post, they can measure oncoming or passing vehicles. However, if I were to fit a jammer I would only fit it to the front. My theory being that you should have seen the officer with the gun by the time you pass him and have already slowed down
Hope this is of help.
The laser gun, which is the most modern and common in use by my white topped former colleagues, is deadly accurate. It can also "get you" from up to one kilometre away, so beware! They can zap traffic coming towards or driving away, but what Relaxitscool says is very sound. Also, the only way to stop someone accelerating away in to speed after them, which usually requires a motorcyclist on standby. Which is often present, as some very naughty motorists don't always stop when a hand is held aloft!
LIDAR units are bang on as Xplod says - there's no way you can argue with one of those babies. I've sent my LIDAR diffusers away for replacement (kept falsing). but they've possibly saved my bacon in one instance that I know of. Going quite quick 85+ on the MWay and got 'shot' with a LIDAR. Diffusers went ape as did my LASER detector. Pair of plod on the bridge at around 1/4 mile with LIDAR unit. To be fair, the traffice was extremely light - there's wasn't another car within 500yds of me, but I was going a bit too fast...
Out of interest, on the A419 outside Cheltenham, there's often a police car on the bridge by M5 J11a with a plod what looks like staring through a box at the traffic on the dual carrigaeway below. Is this some sort of hand held LIDAR...? Thing is, he had the windows UP...! I though IR struggled to go through glass, and they'd have major problems.
I suppose they could have been buck-rogers style binoculars
Out of interest, on the A419 outside Cheltenham, there's often a police car on the bridge by M5 J11a with a plod what looks like staring through a box at the traffic on the dual carrigaeway below. Is this some sort of hand held LIDAR...? Thing is, he had the windows UP...! I though IR struggled to go through glass, and they'd have major problems.
I suppose they could have been buck-rogers style binoculars
here's a question... the second thing the white hat said to me was "I do realise there was a silver BMW pushing up behind you that may have caused you to drive faster"... how do I know the speed on the laser was mine and not the BMW's, esp. given that I was doing a MUCH lower speed when I first noticed the police car?
You don't know it yours insofar as you have to take plod's word for the fact that he was pointing the laser at you. The spot of light the laser projects is going to be small. THere is no way it could point at both cars simultaneously or get a confused reading.
(re. infra-red light not going thru glass, far infrared won't pass, but I'm pretty sure near infrared will.)
(re. infra-red light not going thru glass, far infrared won't pass, but I'm pretty sure near infrared will.)
Having got a hold of a Lastech LTI 20.20 laser gun manufacturers operators manual I can confirm that the device cannot be used through glass. Apparently the accuracy of the device cannot be brought into question in court since the device will actually error rather than give a measurement. If one is used over a bridge then the bridge height has to be taken into account in consideration of COSine. But unfortunately this is in favour of the driver and will read down the actual speed. Same can be said for angle of device to direction of traffic on the same physical plane.
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