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Mobile Speed Camera - Line of Sight, What can they see?
JJones5655
post Fri, 23 Feb 2018 - 14:57
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Hi

Just took a trip to the garage at lunch time, and i think i may have been zapped by a mobile speed camera van.

The road is a 40mph dual carriage way, with the van parked up on the bank with the rear facing oncoming traffic.

I was on auto pilot, being in the 1st lane i saw i was approaching a slow moving line of traffic. Without thinking i moved over to the right lane.

However it was then i realized that the reason for the slow moving traffic in the first lane was because of the camera.

I was doing about 55 before spotting the van, then immediately braked.

My question is regarding the line of sight of the camera ?

I have read that they send out a laser at 22.5 degrees to capture cars passing through this laser. Is this still the case? or do they point and shoot?

The reason being is that i am hopeful my speed would have decreased dramatically before the 22.5 degree angle.

I know that when passing the van i was down to 40.

Also - could the cars moving slowly in the first lane blocked their view of me ? Surely they would have had to have a clear sight of my vehicle reg? I certainly couldnt see them, so i am hopeful they couldnt see my reg.

Attached is the van's viewpoint ... The van was parked in the laybay with the arrow on.


I was approaching in the fast lane.


Any thoughts would be greatly appreciated !
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post Fri, 23 Feb 2018 - 14:57
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NewJudge
post Fri, 23 Feb 2018 - 15:29
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My first thought is that I cannot see from the photo anything to suggest that the road is subject to a 40mph limit. It doesn't really show enough to see if there are "40" repeaters. Are there any?
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JJones5655
post Fri, 23 Feb 2018 - 15:41
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QUOTE (NewJudge @ Fri, 23 Feb 2018 - 15:29) *
My first thought is that I cannot see from the photo anything to suggest that the road is subject to a 40mph limit. It doesn't really show enough to see if there are "40" repeaters. Are there any?



Whats the law on frequency and distance of these signs? I didnt even think about that

Ive attached an image of the first and only speed limit sign.

Ive marked the approx position of the van with a red dot
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122basy
post Fri, 23 Feb 2018 - 15:48
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If you were in Ireland you will be OK, they have a radar at 23 degrees to the van.

A laser operator can move the laser wherever he likes and will be waiting for you to arrive. Unless he was having his tea, packing up or setting up you will have been measured 100's of metres away and most likely exactly where you were fastest.
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JJones5655
post Fri, 23 Feb 2018 - 15:54
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QUOTE (122basy @ Fri, 23 Feb 2018 - 15:48) *
If you were in Ireland you will be OK, they have a radar at 23 degrees to the van.

A laser operator can move the laser wherever he likes and will be waiting for you to arrive. Unless he was having his tea, packing up or setting up you will have been measured 100's of metres away and most likely exactly where you were fastest.



Thanks for your reply.

There was a line of traffic in the fist lane ( pictures above) i was originally in that lane - so i cannot understand how they can ping you without seeing your vehicle reg. I am sure it would have hidden due to the distance and line of traffic.

When i did the overtaking manoeuvre it was on the set of traffic lights ( first picture) - Again the angle of their view surely would have hidden my vehicle reg until i was in the outside lane. It was at that point i slammed on my brakes.



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The Rookie
post Fri, 23 Feb 2018 - 16:11
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The 22.5 degrees is for Gatso, nothing to do with laser which are aimed along the operators line of site.

This post has been edited by The Rookie: Fri, 23 Feb 2018 - 16:15


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DancingDad
post Fri, 23 Feb 2018 - 16:29
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Can ping you if they can see you and can be from quite a distance.
Don't need to see the reg number, that can be collected from later video or even Mk1 Eyeball.
As more then one biker has found.
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Jlc
post Fri, 23 Feb 2018 - 16:41
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QUOTE (The Rookie @ Fri, 23 Feb 2018 - 16:11) *
The 22.5 degrees is for Gatso, nothing to do with laser which are aimed along the operators line of site.

Indeed. A such devices can correct the speed measurement to produce a 'true' speed.

Laser devices will also measure at angles too and the figure returned is smaller than the true speed due to the 'cosine effect'. Generally, this measurement will be within a few degrees and the reduction is tiny, e.g. 2 degrees would give 99.9%. (22.5 degrees is over 92%)


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666
post Fri, 23 Feb 2018 - 17:14
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QUOTE (JJones5655 @ Fri, 23 Feb 2018 - 15:41) *
QUOTE (NewJudge @ Fri, 23 Feb 2018 - 15:29) *
My first thought is that I cannot see from the photo anything to suggest that the road is subject to a 40mph limit. It doesn't really show enough to see if there are "40" repeaters. Are there any?



Whats the law on frequency and distance of these signs? I didnt even think about that

Ive attached an image of the first and only speed limit sign.

Ive marked the approx position of the van with a red dot


But without signs it would be subject to a 30 mph limit, which wouldn't help you.
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southpaw82
post Fri, 23 Feb 2018 - 18:30
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QUOTE (666 @ Fri, 23 Feb 2018 - 17:14) *
But without signs it would be subject to a 30 mph limit, which wouldn't help you.

Only if it’s a restricted road. If the council has imposed a different speed limit then chances are it’s no longer a restricted road.


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Any comments made do not constitute legal advice and should not be relied upon. No lawyer/client relationship should be assumed nor should any duty of care be owed.
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notmeatloaf
post Fri, 23 Feb 2018 - 21:53
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Just to add to the above, they normally "target" your numberplate because it happens to be vaguely in the middle of the big flat surface of the front of your car.

They could of course target something different but as you have found out when you see them they see you. They are likely to react quicker if they aren't setting up/packing up/having a cup of tea/crying about their miserable job.
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captain swoop
post Sat, 24 Feb 2018 - 00:24
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QUOTE (notmeatloaf @ Fri, 23 Feb 2018 - 21:53) *
crying about their miserable job.



I don't know, it's inside and sat down.
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The Rookie
post Sat, 24 Feb 2018 - 09:29
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QUOTE (JJones5655 @ Fri, 23 Feb 2018 - 16:54) *
There was a line of traffic in the first lane ( pictures above) i was originally in that lane - so i cannot understand how they can ping you without seeing your vehicle reg. I am sure it would have hidden due to the distance and line of traffic.

Nothing to stop them pinging you with no reg plate visible and noting it as you then drive past.


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There is no such thing as a law abiding motorist, just those who have been scammed and those yet to be scammed!

S172's
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Council PCN's
Rookies 1-0 Warwick
Rookies 1-0 Birmingham

PPC PCN's
Rookies 10-0 PPC's
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