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Motorway speeding ticket for 80mph?

Whitenemesis, yep they were sold as show plates, and yep I knew they were a tad illegal, I've never tried to deny that, just took a chance and unfortunately got the wrong cop that day.
And Yugguy , i never lied to him or was i offhand, coz obviously I knew I was in the wrong.
I would hardly class meself as a criminal for having tinted plates.
 
The days of the cable-driven 'vaguelier' (Veglia) speedo are long gone, thank goodness.

Plenty of cars still using cable driven speedos - including most of the ones I drive .
 
Where I work is a very large site, it's about 15 minute walk from my "office" to the main entrance and some of the other places we have to go to. It has an extremely strict 20mph speed limit onsite - 3 strikes and you're not allowed to drive on site :) There are speed detectors all over the place, I put my car on cruise at 22mph and every detector reads 20, my old W204 C class also read 20 on the detectors when set to 22 on cruise. The GPS on my phone also reads 20.
For me, this just adds to the whole +10% thing. I've not had the guts to drive past one doing 33 to see if it'll read 30 :)
 
Plenty of cars still using cable driven speedos - including most of the ones I drive .
Cable driven speedo... phwa.

I am old enough to remember when the rev counter was driven by a cable fed by a small cogwheel in coolant pump. And you knew the pump was on its way out when the rev counter started playing up!
 
There it is... the tachometer cable fed from the coolant pump on an Alfa Romeo:

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For me, this just adds to the whole +10% thing. I've not had the guts to drive past one doing 33 to see if it'll read 30 :)

I’m not sure about the 10% assumption: it’s my observation using GPS that my speedo overreads by 2mph at all speeds. Hence I tend to drive a lot at an indicated 72mph.
 
Funnily enough, I recently heard on the radio a road safety campaign message explaining to drivers what does 'appropriate apeed' mean.
 
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My W204 shows 2mph under at all speeds as well

Going off road side radar speed displays my W204 seems to be spot on which is a nice change from my BMW motorcycle which by the same displays over reads by a full 10% and more.

The law says that speedos must not under read so manufacturers deliberately made them over read to play safe. I assume the technology is now available to give manufacturers enough confidence to make them spot on or very close. Even 2 mph is very good compared to how they were in older vehicles.
 
I’m not sure about the 10% assumption: it’s my observation using GPS that my speedo overreads by 2mph at all speeds. Hence I tend to drive a lot at an indicated 72mph.
So I drove around the site today and hit a lot of the detectors with GPS Test Plus running - cruise set to 22, detectors showing 20, I when through ONE at 32 on cruise at it showed 30. I slowed down quickly :D
 
Several of these detectors have been installed on the Southern Perimeter Road at Heathrow now. They too confirm that all my cars are doing 38 mph at an indicated 40. If I stick to a true 40, I slowly pass almost everything else, so it would seem other makes are the same.

The Aprilia (Italian, red, so must be fast...), by contrast, is doing 40 at an indicated 45.

Note, however, that I still assume the enforcement threshold is 10% + 2 mph...;)
 
It has to be said that , quite aside of the legislation governing the accuracy of car speedometers ; and discussions regarding their accuracy compared with other devices - the only devices which carry any weight in law are the approved devices used by police to check the speed of vehicles .

All of your personal GPS devices , roadside radar operated speed indicators and what-have-you are NOT government approved devices and , absent a legally recognised and accredited calibration certificate , have no meaning whatsoever in law .

If you were taken to court on a marginal speeding charge and argued that you 'knew' your car speedometer was over indicating on the basis of comparison with one of these other devices , you'd be laughed out of court along with your fine and points .

As far as the law is concerned , the only indicator of speed you have is the one fitted to your car , if you choose to ignore it because you feel you know better then you do so at your own peril .

The measuring devices used by the police for enforcement have to be Home Office approved and calibrated , this applies to all static devices used at the roadside , as well as equipment fitted to traffic cars , the speedometers of which have to be calibrated at the start of a shift and at the end if to be used for speed enforcement .
 
80 mph is a bit rough. Either the cop is a dxck or the lad done was driving like dxck. I can't believe if you were safely cruising at 80 getting pulled. I would not think twice about passing a traffic car at that speed
 
80 mph is a bit rough. Either the cop is a dxck or the lad done was driving like dxck. I can't believe if you were safely cruising at 80 getting pulled. I would not think twice about passing a traffic car at that speed
You are a fool then
 

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