Interesting laser speed guns read..

[Ste]

https://www.pepipoo.com/NewForums2/viewtopic.php?t=419

Interesting read.

[Dusty]

Interesting.

Just need someone to stand their ground, fight them and hopefully set a legal precedent. They did seem reluctant to reply which suggests there may be some truth to the inaccuracy.
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[Kris]

Fantastic read. Anyone know what type of laser the Talivans use out of interest, maybe T.C. would know?

Surely the same argument applies, especially if they get you effectively from an angle (in a layby for example).


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[Ste]

You read the bit about the headlight? I'd be interested to know how they can prove that it hit a flat surface, not the rider, not the headlight and that it even actually hit you!

Maybe we need to make a set of glass fairings

[NSR125-Kid-UK]

I dunno about that, cos i like the fairings to hide all the squiggley bits underneath .
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[Ste]

It's called the engine

[Korn]

In my case the copper who got me showed me his gun, with the speed reading 68mph and the range showing 1350 yards. He said he measured my speed by "aiming the crosshair at the headlight of your vehicle as you approached".

I just accepted this to be my speed as I wasn't making any particular effort to stick to the limit seeing as how I had the whole three lanes to myself, and hadn't bothered to look at the speedo.
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3516 Miles, 11 Countries

[Dusty]

Someone said later in the thread that the rule does not apply to glass on the bike and that the headlight is actually a good target because of the reflective properties of the back of it.

The rule is aimed at glass near the gun, for example if the cop decides to sit in his car and use it, which is against the rules for several other reasons anyway.

I think you should get some glass fairings though Ste, we could all take bets on how many minutes/hours they would last.
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[Ste]

They'd be ok with me. Look at my fairings... in one piece and shiney. Now go look a the R6 ones

And it says something on there about cops getting headaches if it's used in a car

[Dusty]

[Ste]

Ok, so it needs cleaning but I'm commuting every day on it so there seems to be little point (I've been saying that since BDB ) However they are complete and have no scratches

Back on topic... surely the headlight will reflact different beams back as it isnt at all flat so will give different speed readings if it hits it?

[NSR125-Kid-UK]

[Ste]

[NSR125-Kid-UK]

[Kickstart]

[NSR125-Kid-UK]

I thought a characteristic of lasers was that a single beam does not spread out over distance. Does this thingie use more than one mto get a better chance of scoring a kill against a target?
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"I'm either going to teach andy to get his knee down, or I'm going to get him killed. One of the two" - Teaman

[Dusty]

From what I understood of the thread, the argument that the beam may hit moving objects is more likely to be a realistic argument against their use, but has been tried before without success . For example if it hits a number plate that is vibrating, depending which way the plate is moving when the beam hits it, it may give a reading over or under the speed of the bike. Or if it hit a spoke on the top half of the wheel as the bike if moving away from the gun, the spoke will be moving away from the gun at a higher speed than the bike. But as I said someone tried this argument and lost. The guns fire 3 beams in a second so the vibrations would have to be quite severe to cause a misread.

As far as hitting an angled surface goes, the light will be reflected at an equal but opposite angle to which it hit the surface, so will be reflected away from the gun, hence it will not register unless it reflects off something else and goes back to the gun. But the chances are that due to the amount the light diverges on route to the bike that some of it will hit a surface that is nearly at right angles to the beam, so some is likely to be reflected back and registered on the gun.

[NSR125-Kid-UK]

My mate's got a matt black (stipple effect!!) RS250.
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"I'm either going to teach andy to get his knee down, or I'm going to get him killed. One of the two" - Teaman