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Postal Speeding Notice

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Re: Postal Speeding Notice

Post by assassin on Wed Dec 27, 2017 1:12 am

@NoSurender wrote:
@assassin wrote:These are average speed cameras and not a stand alone camera, so what does it mean?

They dont need road markings to determine the speed as this is done by at least two cameras over a fixed distance and they measure the time between them, it then comes down to distance over time taken, from this it automatically works out the average speed taken to cover a specific distance.

Average speed cameras can work in pairs or networks and they often site them on long, fast roads with a lot of hilly terrain as they know people often lift off downhill and the mass of the vehicle carries it over the speed limit, Manchester was a good example of this.

They can be used in pairs in po-lice cars and Derbyshire used a lot of them on the faster roads in more remote areas, they parked a traffic car up in a lay-by and as you passed it you triggered the system, you carried on and you came across a second plod mobile and as you passed it the cut off beam was triggered and it gave an average speed and you got a ticket in the post.
Many of us got around them very simply, we saw a plod mobile parked up and passed it, as we approached the second plod mobile we didn't go past it, we pulled up behind it in the lay-by and didn't trigger the second beam, we would do all sorts, make phone calls, have a cup of coffee, or anything else which wasted time. When we eventually puled off and passed the second plod mobile and tripped the system our average speed was lower than Steptoes horse and cart.  

Acctually they do, so I don't know who has told you this?

Average speed cameras still have to work from a point to point reference, so without that reference (a mark on the road), where is the start distance point taken from and where does it finish without reference marks..?? What is it just a guess??

Try looking up the law as nobody has told me this and then try following it up with reading the manufacturers instructions of how the cameras work.
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Re: Postal Speeding Notice

Post by pieintheskywhenIdie on Wed Dec 27, 2017 10:18 am

Just about all speed cameras have road marks to prove the car in the picture is the one speeding.  Some average speed cameras have marks.  Why not all?  Maybe because they measure over a long distance, so the exact position they clocked your car (or your numberplate) doesn't make much difference.  Suppose they are 1/2 mile apart, an error of 8 metres makes only 1% error in speed.

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Re: Postal Speeding Notice

Post by daveiron on Wed Dec 27, 2017 10:35 am

Sometimes the easiest way to get the answer to questions is simply do a FOI request .
Do it on line ,costs nothing,then post the response in the FOI section here.

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Re: Postal Speeding Notice

Post by assassin on Thu Dec 28, 2017 2:14 am

@pieintheskywhenIdie wrote:Just about all speed cameras have road marks to prove the car in the picture is the one speeding.  Some average speed cameras have marks.  Why not all?  Maybe because they measure over a long distance, so the exact position they clocked your car (or your numberplate) doesn't make much difference.  Suppose they are 1/2 mile apart, an error of 8 metres makes only 1% error in speed.

It all depends on the camera type, in all cases they need a trigger point and this is usually the front of the car passing a sensor which is usually an invisible radar beam and the point of detection/activation is the front of the car in most cases, but not all. As most fixed average speed cameras are overhead they can use any fixed feature such as the white line in the middle of the road, a signpost standard, the corner of a building, or in some cases the fixed metal plates in the road which are used for measuring GPS data for road monitoring purposes and as they generate a 3D map they automatically compensate for the height and width of a vehicle.

Many average speed devices are not fixed and are mobile devices carried by two vehicles such as two po-lice vehicles and they are not 3D devices as they fire a beam of lasers in an vertical arc across the road to trigger and stop a device recording an average speed, they are connected using GPS to determine their distances apart and are usually in vehicles parked in specific places which have been manually measured beforehand.
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Re: Postal Speeding Notice

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