The True Speed (and distance) |

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The True Speed (and distance) May 13, 2017 9:04:53 GMT via mobile

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Post by Administrator on May 13, 2017 9:04:53 GMT

Most people have heard a rumour that some vehicles speedometers are under calibrated.

I actually believe the Government has made a deal with car manufacturers to set speedometers 3mph out of calibration on purpose just to confuse matters and make it more difficult to spot the innacuracy of thr polices radar and laser devices when put under scrutiny between different vehicle profiles.

I have been gathering evidence of "your speed" radar signs all being mostly about 3mph incorrect.

So now i am gathering more tests with GPS phone speedometers to compare with.

What implications can this have on driving?

Well... On a driving theory test and in lessons we are TOLD and TAUGHT certain safety distances and measurememts for stopping and emergency stops. But also matjematics tells us we will cover certain distances at certain speeds over time.. So if you think you are going at 30mph and will have enough time and distance to get through an amber light... The truth might be that if your speedometer is under calibrated then you might only be going 27mph and might not get past the traffic light stop line in time. And as they are prosecuting people for decimals of seconds like 0.5 and 0.7 then the 3mph that has been tricked from you by the car companies is in fact false or incorrect information and guidance. And the Highway code distances will be misinformation.

Also... How can anyone do their own legal experiments with a vehicle thats not calibrated correctly? And how can the police or a court claim you knew your exact speed? Also their own equipment is unreliable as well.

Here is what the 3mph speedometer error calculates to in terms of the stopping distances

Highway Code Stopping distances are incorrect by the following margins when speedometer is not calibrated correctly. (3mph)

http://www.bentcop.biz/adjust_stopping-distances.jpg

Distance less than you will need to stop. Approx.
20mph 0.9m
30mph 1.4m
40mph 1.8m
50mph 2.28m
60mph 2.75m
70mph 3.21m

Error in estimated Distance covered on approach to traffic lights when speedometer is under calibrated... In comparison to Highway code taught distances.

Heres an example of an amber light event i saw the other day

Last Edit: May 15, 2017 21:15:21 GMT by Administrator

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The True Speed (and distance) May 13, 2017 9:21:56 GMT

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Post by Administrator on May 13, 2017 9:21:56 GMT

So, if you are approaching a set of traffic lights... and it turns to amber.. and you use mathematics to work out of you will get past the stop line before the light goes red... and work it out as if you were moving at 30mph... when your speedometer has been under calibrated by somebody... then you will be covering less distance in the time (3 seconds) of amber than what we are taught and learned by maths and driving schools...

So that would cut you short at the traffic lights by anywhere from 0.1 to 1 second or moe depending on your circumstances..

And many, many Prosecutions are in the decimal of a second time.. like 0.7 seconds (except apparently in Dorset where they give you 1 second error time)

So i will do an example table..

Also.. i will note that my 0.7 second Macclesfield traffic light time.. was recorded at 26mph and when i drove through at 26mph with it video recorded at a later date.. the distances with time were not the same as in the Cheshire police photos.. it was in fact around 1 meter incorrect distance. So that could explain the reason why. And if that is so.. how can any driver be expected to make speed over distance calculations themselves when their own vehicle is not telling them the correct numbers.

So, nobody can be expected to be correct by 0.7 of a second. As they have been given the wrong numbers to work with. From the day of Driving lessons and Driving different vehicles possibly multiple vehicles on different days.

Then.. added to this.. you have the whole tyre size issue which needs more experiment.. and the Magnetic field off sett for traffipax cameras which can never be measured 100% as every vehicle has a different magnetic field strength on approach, and timing.

Last Edit: May 13, 2017 9:28:03 GMT by Administrator

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The True Speed (and distance) May 13, 2017 9:34:11 GMT

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Post by Administrator on May 13, 2017 9:34:11 GMT

This is an example of the 3 second amber time and the different distances you will cover in that amber time, with a 3mph speed offset.

in 3 seconds at 26mph distance 0.0348km (34.8 meters)
in 3 seconds at 29mph distance 0.0388km (38.8 meters)

So if you think you are travelling at 29mph, but your real speed is 26mph.. then you will be covering 4 meters less over the 3 seconds of amber, than you might calculate in your mind, if you are good at knowing the distance of road and features... although you are expected to to pass the driving theory test and know the stopping distances.

Here, at Macclesfield.... 4 Meters... Which is the type of distance that other people and myself have been getting caught out at, at traffic lights. by decimals of seconds... yet in Dorset drivers are not prosecuted for this time (1 second or under)

http://www.bentcop.biz/fourwholemeters.png

http://www.bentcop.biz/Screenshot_2017-05-12-23-33-25.png

http://www.bentcop.biz/Screenshot_2017-05-12-23-33-38.png

Last Edit: May 13, 2017 9:44:46 GMT by Administrator

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The True Speed (and distance) May 13, 2017 9:52:26 GMT

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Post by Administrator on May 13, 2017 9:52:26 GMT

I question the VW van centre and they give evidence that the speedometer is supposed to be correct, not undercalibrated on purpose.

Test of the radar your speed signs (i have quite a few videos of these... different signs tested and 99% of them are 3mph incorrect to the speedo, and on other vehicles as well. Some are even MORE in error!

so its the radar, not just the vehicle that is wrong

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The True Speed (and distance) May 13, 2017 12:29:37 GMT

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Post by Administrator on May 13, 2017 12:29:37 GMT

Also, it turns out that the GPS speed (when its tracking it steady) can be MORE ACCURATE than BOTH THE POLICE LASER AND THE VEHICLES OWN SPEEDOMETER!

Although the GPS ones do drop and skip, but they seem to get the correct speed, or same speed as the Your speed radar signs, which is -3mph to the vehicles speedometers.

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Administrator Good Standing up to corruption and criminals working in the justice system Posts: 10,541	The True Speed (and distance) May 13, 2017 12:53:23 GMT Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Administrator on May 13, 2017 12:53:23 GMT
	Last Edit: May 13, 2017 12:54:04 GMT by Administrator 1688 Bill of Rights - The right to Petition - It is the Right of the Subjects to petition the Queen & all Commitments & Prosecutions for doing so are illegal.

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The True Speed (and distance) May 13, 2017 14:28:42 GMT

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Post by Administrator on May 13, 2017 14:28:42 GMT

I just dont seriously see how the police can even clam "your LTI" or "Prolaser III" is no good as evidence as its not calibrated or approved.. yet they are prosecuting & convicting vehicles that dont have correctly set speedometers.. so technically how can they be approved by the BRITISH GOVERNMENT for SALE & USE in the UK? when the vehicles are NOT accurate or calibrated to be compatible with POLICE measurement devices?

Its like saying the "POLICE ARE ALWAYS RIGHT" and "YOU ARE ALWAYS WRONG" every time. as soon as you get in a vehicle before you set off..

This Government attitude is evident in the Fraudulent unfair Court rules where they are not even letting you claim back all your legal expendes even if found not guilty on driving offences...

How can it be Justice? to be Immediately in dept because a Police Van was on a road on a random date and even though you are "innocent until proven guilty" you are really AUTOMATICALLY IN DEBT *IF YOU WANT LEGAL HELP & DEFENCE* which without you have less chance of winning.. seeing as the Police will not even admit when the road signs are unlawfull.

TERRORISM.

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The True Speed (and distance) May 13, 2017 16:42:43 GMT via mobile

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Post by Administrator on May 13, 2017 16:42:43 GMT

Heres what one website says about speedometers

www.thecarexpert.co.uk/how-accurate-is-a-car-speedometer/

“If my satnav shows I’m going four to five miles per hour slower than my car speedometer says, which do I believe?” Asked by Tabitha, September 2012

Having recently bought a used car, Tabitha began to notice that there was a consistent discrepancy between the speed showing on her speedometer and that on her portable satellite navigation unit. At most speeds, the speedo reading was several mph faster than her satnav unit was indicating.

Many other drivers have reported the same thing over the years, and this situation is actually common to nearly every car on the market. But why is this the case? Surely car manufacturers can make their speedos accurate to the precise mph or km/h you are travelling at?

How a car speedometer works

Speed is the measurement of distance over time. But a car speedometer doesn’t actually measure how fast you travel from Point A to Point B. Car speedos usually work by measuring rotation of the car’s driveshaft, axle or wheel. They then use some basic maths to extrapolate that rotation and determine how fast you are travelling. It’s a very similar concept to a bicycle speedometer.

However, if the diameter of the wheel/tyre alters, the extrapolation calculation will be incorrect. For example, the diameter will increase if you put new tyres on the car (more tread, which wears down over thousands of miles) or increase the tyre pressure. This means that, for each revolution of the wheel, the car is travelling further, meaning your speed is greater.

If the diameter decreases (eg – worn tyres, less air in the tyres, a different brand of tyre with slightly different dimensions, more load in the car weighing it down and compressing the tyres), then the car will be travelling a shorter distance for each revolution of the wheel, therefore you will be going slower.

Margin of error in a car speedometer

How accurate is your car speedometer?
By Stuart Masson - 19 September 2012125658 47

“If my satnav shows I’m going four to five miles per hour slower than my car speedometer says, which do I believe?” Asked by Tabitha, September 2012

Having recently bought a used car, Tabitha began to notice that there was a consistent discrepancy between the speed showing on her speedometer and that on her portable satellite navigation unit. At most speeds, the speedo reading was several mph faster than her satnav unit was indicating.

Many other drivers have reported the same thing over the years, and this situation is actually common to nearly every car on the market. But why is this the case? Surely car manufacturers can make their speedos accurate to the precise mph or km/h you are travelling at?

How a car speedometer works

Speed is the measurement of distance over time. But a car speedometer doesn’t actually measure how fast you travel from Point A to Point B. Car speedos usually work by measuring rotation of the car’s driveshaft, axle or wheel. They then use some basic maths to extrapolate that rotation and determine how fast you are travelling. It’s a very similar concept to a bicycle speedometer.

However, if the diameter of the wheel/tyre alters, the extrapolation calculation will be incorrect. For example, the diameter will increase if you put new tyres on the car (more tread, which wears down over thousands of miles) or increase the tyre pressure. This means that, for each revolution of the wheel, the car is travelling further, meaning your speed is greater.

If the diameter decreases (eg – worn tyres, less air in the tyres, a different brand of tyre with slightly different dimensions, more load in the car weighing it down and compressing the tyres), then the car will be travelling a shorter distance for each revolution of the wheel, therefore you will be going slower.

Margin of error in a car speedometer

The differences in wheel diameter resulting from the above circumstances could be tiny (maybe a few millimetres), but at 30mph your car wheels are rotating 6-7 times every second, so it can quickly make a difference of a few miles per hour. This margin for error is taken into account in how the law is applied, and how manufacturers calibrate their car speedos.

How a satnav speedometer works

Satellite navigation units (either portable or integrated into the car) calculate your car’s speed by measuring actual distance travelled over time using GPS satellite tracking. They repeatedly locate your exact position on earth via satellite and calculate how far you have travelled, then divide by the time it took for you to travel that distance. Satnav accuracy is determined by satellite signal quality and is unaffected by your car’s tyres. Many satnavs are unable to account for changes in vertical direction, so may be less accurate if you are travelling up or down a steep hill. They are also inherently more accurate at higher speeds, as a larger distance over time reduces rounding errors, but a satnav will usually be much closer to a car’s true speed than the speedometer.

Some factory satnav systems will also use data from the car to integrate with the GPS signal to improve overall accuracy.

The law for car speedometers in the UK

The UK law is based on the EU standard, with some minor changes. A speedo must never show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph. So if your true speed is 40mph, your speedo could legally be reading up to 50.25mph but never less than 40mph. Or to put it another way, if your speedo is reading 50mph, you won’t be doing more than 50mph but it’s possible you might actually only be travelling at 40mph.

To ensure that they comply with the law and make sure that their speedometers are never showing less than true speed under any foreseeable circumstances, car manufacturers will normally deliberately calibrate their speedos to read ‘high’ by a certain amount. As your satnav is not the designated device by which a car’s speed is measured, it does not need to incorporate any fudge factoring.

Funny how they can get it to never show less than the actual speed.

Rather than 3mph more than true speed.. Woyldnt a simple +/- 1mph tolerance be more useful?

Its like its wrong on purpose ..and i believe at traffic light cameras it works opposite as it does to speed cameras.

Last Edit: May 13, 2017 16:48:49 GMT by Administrator

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Administrator Good Standing up to corruption and criminals working in the justice system Posts: 10,541	The True Speed (and distance) May 13, 2017 19:39:50 GMT Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Administrator on May 13, 2017 19:39:50 GMT
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Administrator Good Standing up to corruption and criminals working in the justice system Posts: 10,541	The True Speed (and distance) May 13, 2017 20:39:45 GMT Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Administrator on May 13, 2017 20:39:45 GMT
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Administrator Good Standing up to corruption and criminals working in the justice system Posts: 10,541	The True Speed (and distance) May 13, 2017 22:30:17 GMT Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Administrator on May 13, 2017 22:30:17 GMT
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The True Speed (and distance) May 15, 2017 9:06:59 GMT

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Post by Administrator on May 15, 2017 9:06:59 GMT

Here Testing the accuracy of the LTI 100 LR with the Pocket Radar VS a M3 your speed sign at Marr, South Yorkshire.. Sunday.

The Angle of vehicle Cosine effect is very noticable and "live"... the speed reading actually changes as vehicles pass the sign.

The same speed reading can be obtained by the LTI and Pocket radar.. only if you time it exactly right. So its the same distance when the M3 sign takes a reading

Then i test a fixed speed camera out. And somew heated points on Speedometer calibration preventing people from properly testing & gathering evidence on speed camera accuracy.

MARR RADAR SIGN GETS THE VAN SPEED CORRECT! JUST ONCE! LOOK 40MPH EXACT! but only BRIELFY on ONE of the TRYS!?

Pass1

Pass2

Pass3

Pass4

FIXED CAMERA TEST BARNSLEY at Doncaster road between St. Pauls Parade and Chapel Ct.

http://www.bentcop.biz/Doncaster_rd_A635_barnsley_st.paulsparade-chapel.ct.png

http://www.bentcop.biz/Barnsley_cam1.png

http://www.bentcop.biz/barnsley_cam2.png

Last Edit: May 15, 2017 20:51:24 GMT by Administrator

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The True Speed (and distance) May 15, 2017 13:22:00 GMT

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Post by Administrator on May 15, 2017 13:22:00 GMT

To know stopping distances you have been taught, and make your own accurate calculations while driving, you need an accurate speedometer, because you will need to know the distance you are travelling over time.

Also iff you want to challenge a ticket and defend yourself you will need an accurate speedometer to film to prove the police equipment was not correct.

This is difficult when your speedometer is not accurate. Also, as the police cannot even use their own equipment without calibration accuracy certificates.. how can you as a driver BE prosecuted if you have not been adequately provided with accurate vehicle equipment and readings?

Its not a matter of being slower, as sometimes you need to be faster or the correct speed, to make a distance you are calculating with curbs or sign spacing. The 3mph speedometer error is not going to help but hinder driving.

http://www.bentcop.biz/20170515_122108.jpg

Also, with speed limits lowered across the country, and vehicles set 3mph slower.. its a wonder we even need enforcement cameras at all anymore.

Last Edit: May 15, 2017 13:27:02 GMT by Administrator

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The True Speed (and distance) May 15, 2017 20:48:04 GMT via mobile

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Post by Administrator on May 15, 2017 20:48:04 GMT

Ok... So..

Ive gad reason to believe the van ( and most speedometers) are calibrated 3mph higher than true speed.

But yesterday 14th May in Marr...
I had a SPEEDO CORRECT reading of 40mph from an M3 your speed sign...

But only briefly for a fraction of a second.. Then the reading went lower...

So is the Cosine effect more of a factor with these other speed signs?

The thing is that the M3 sign did not get the speeds until closer range when more cosine is in effect... But earlier on.. First moment the reading was more accurate!

But if this was the same with the SWARCO signs... That get your speed earlier.. A lot earlier and at a straighter angle..
Shouldnt they be more accurate to tne vehicle speed than 3mph wrong? Because there is much less cosine..

So the mystery again comes back to the tolerance settings!! Aargh!!

We really need to establish the vehicles speedometers exact calibration accuracy...

But....
In LAW... Isnt the case really resting on what the driver THOUGHT he was doing? Or intended to do? Or believed he or she was doing?

In which case... That would be rested on the information your speedometer IS giving you. Or the most accurate info it can give you after the manufacturer has said its the most accurate it can be and it cannot be adjusted...

Thus... Really...

Your speedometer is more important than tne police enforcement camera evidence.

But.. Its a lot more difficult as general challenge to the police devices when tne tables are turned because its not on you then...as your defence

Its on them... Unless you really do have a calibrated speedometer to prosecute them with.

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The True Speed (and distance) May 15, 2017 21:00:34 GMT via mobile

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Post by Administrator on May 15, 2017 21:00:34 GMT

The thing is... That this set up is practically the same set up as a fixed speed camera...

So the speed the radar reads is going to be changing as you drive past!! Even if you maintain the exact same speed...

If you are driving towards a fixed camera thats facing you... Your speed will reduce.

If you are driving away from a fixed camera thats aiming at you from behind as you drive away.. The read speed will increase...

Also you may be CHANGING speed yourself as you drive past.. Going up or down..

Like at the Doncaster road camera Barnsley that i filmed yesterday driving through.

44mph 45mph 46mph.

Even if it had been a straight 46mph..
The radar would have read something like 44mph 45mph 46mph as the cosine reduced as i was passing.. (If it was accurate anyway)

With the Your Speed signs.. They dont always get the initial speed right or the same every time anyway even if you are approaching at the exact same speed every time..

Which means when they first pick you up.. It will track the speed and change from tne initial speed. And it might be wrong from the start.

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