Well, there's now an advisory on all of them and some have "real" limits. But last time I did the trip (2019) the ones I were on were "free range" - the looks on Ferrari drivers' faces when an A6 estate blows past them at over 300k has to been seen to be believed (many German registered supercars are limited to about 250k, so having an unlimited RHD with UK plate is a bit of a strange beast. (By now it will be on a Swiss plate, but will still be RHD)

Yeh, the Frogs are like that :-(
On one of those trips I did have some fun with a Swiss cop - I'd dropped down from 120 to 30 for a village with a school, then hit the power hard at the 120 board, and he was just round the corner - I had the limiter set to 120 and it worked very well. I was pulled on the grounds that no A6 with that amount of stuff in the back could be doing 120 at the point he clocked me if it had been doing 30 at the board. Nice clear bit of road so I said, well see what this will do, standing start to 120 in a shade under 4s.... He gave up and went home and I continued on my merry way, sticking to the numerous low speed limits as it gets very expensive very quickly in Switzerland.

Jord, I'm not sure your getting your shipments. ;-)
https://www.bbc.com/news/world-europe-56177177
The math is staggering, something over a gram for every person in the country.

Next time better Gary, once I have perfected site to site transportation. :)

Next time better Gary, once I have perfected site to site transportation. :)

With the money behind that it shouldn't take long.

Jord, I'm not sure your getting your shipments. ;-)
https://www.bbc.com/news/world-europe-56177177
The math is staggering, something over a gram for every person in the country.

Holy crap.....
I didn't know they could make that much.

Have to agree 100% on that.
However, on the other hand, the important fact is one of evidence - Whose?
Most people accept the situation with regards to speeding.
Normally, so do I unless the evidence is "dodgy".
Years ago got done for speeding (the only time ever done so) & only knew about it via the mail.
Contested it & stated I'll do so in court.
I had several facts in my favour.
Speed camera clocked me doing 35mph in a 30 zone.
Tachograph showed 32mph.
Magistrate agreed with the police, the camera was correct.
After producing documentation from the D.O.E. regarding tacho's, asking the magistrate:
Who is correct - Speed Cameras or the D.O.E.? Maistrate saw the point raised regarding calibration but had to dismiss the case under the Road Traffic Act.
+/- 10%

Every so often, our transport manager used to pull out a box at our driver meetings. It was filled with warning notices from the D.O.E.
Every driver got a bunch. I signed all of mine with the provisio "under protest" because they were all under 77mph (pedal to the metal as on way home).
Some time later, received a personal communication via Employer from the D.O.E. Tachograph machines are constantly checked for calibration & are 100% correct.
Lovely jubbley, case dismissed. :-)

You do realise you can fiddle those spying machines, right? My friend's a long distance bus driver, and he goes as fast as he likes, he just takes longer breaks for sandwiches and waits at stops longer. Arrives at the correct time, no problem. Dunno what he does with the output of the tacho, but it ends up staying under the limit somehow.

I really enjoy those who "profess" to know something they have no clue about.
What does driving time have to do with speed in the example I posted?

Tosh, you obviously know very little about how the tachograph regulations work, how driver's time works etc. I'll leave it to Sirius to explain some of the nuances of his (former) daily life. All I know is that my old tacho-card recorded driving time, working time, rest time, distance travelled, average sped, instantaneous speed among a whole host of vehicle telemetry data - the latter not being legally required but used to assist in the event of breakdown or accident.

Speed = distance over time. Wrong speed, get there early, boss asks questions. Surely you understand basic physics?

That is not the issue.
What is the issue is the statement driving time equates speed. Yes, quite correct, but totally false for the example I posted.
SO, a nice clear clarification for those who ignore laws.
1: Speed camera caught me speeding.
2: Speed camera registered 35mph.
3: Road speed is 30mph.
No problem, normally, 3 points on license & fine.
4: Tachograph registered 32mph.
Therefore speed camera should have been calibrated to a minium of 34mph for that camera zone as laid down under the law with that +/- 10% tolerance..

Therefore I had a genuine reason for dispute. Wasn't bothered about any fine suffered, it was the 3 points I did not want.
Magistrate & police used speed camera evidence which "normally" for other non tachograph equipped vehicles would be prosecuted without fail.
At the time of being caught & with the numerous warning notices received, regularly told by the D.O.E. that tachograph machines are 100% correct.
THAT FACT enabled me to take the matter to court rather than accept the camera evidence...
...after all the government was telling me that I was not speeding.
Understand now Mr Hucker.
Nothing to do with driving time. :-)
Result - which machine camera or tacho was calibrated correctly?
I had written documentation from the government stating that the answer is tacho. :-)
Police were "stroppy" over it but the magistrate knew what a can of worms he would open should he find in favour of the camera.
Edit: Some years after that incident, I recall several news reports that several road users had also successfully disputed speed camera evidence as they became aware that the cameras are not checked for calibration that often.
Personally, I don't believe anything man made can be 100% anything. However I'd take a tacho reading over speed cameras any day.

SO, a nice clear clarification for those who ignore laws.

I wasn't disputing your speeding dispute, I was telling you you can fiddle the tachos.
However, isn't it true that you can get fined for 31mph? They did in that infamous part of Wales. Which means you just proved yourself to be doing 32 in a zone where 31 is illegal. Give yourself 6 points!

You quoted my post
I re-quoted part of my post to show just how apt it is.
Until the +/- 10% is done away with all drivers have this to fall back on & legally:
30mph - 34mph & over is speeding
40mph - 45mph & over is speeding
50mph - 56mph & over is speeding
60mph - 67mph & over is speeding
70mph - 78mph & over is speeding.

Tachos are calibrated more often than speed cameras.
Why do you think courts base the fines on the difference between the speed limit & the actual speed clocked at?
They take into account that 10% tolerance.
So based on the law, I proved I was not speeding, regardless of what others may think.
My license is still clean. :-)
As for those D.O.E. warning notices they all stated I was doing 71mph or more.
Constant repetition of that 10% tolerance more than likely prevented the local Traffic Commissioner from taking any further action (just a guess).
Of course tachos can be fiddled. Unless one is of a "bent" persuasion, why bother?

All I know is that my old tacho-card recorded driving time, working time, rest time, distance travelled, average sped, instantaneous speed among a whole host of vehicle telemetry data - the latter not being legally required but used to assist in the event of breakdown or accident.

Absolutely, in fact that can be a two way street - for or against the driver.
That fact also dispels the thinking that tacho's are "spying machines"
For some years now, vehicles can have a "black box" fitted which assist one's driving style that reduces one's insurance costs.
With technology as it is today, I believe that all vehicles should be fitted with Tacho's & set to prevent incidents such as this:

Hart, from Lincolnshire, suffered only whiplash. He served 30 months of a five-year jail term after being convicted of 10 counts of causing death by dangerous driving.
"My understanding is that the number of estimated sleep-related accidents, particularly on motorways at night or in the early hours. has not altered in those 20 years," Mrs Dunn says.
"People just seem to think that they're superhuman and it won't happen to them - that was certainly the attitude of that particular individual that day."

Selby 20 years on
Some time ago, can recall watching a program on TV where police had been stopping vehicles just outside Fellixstowe. They caught one truck driver having driven for 30 hours continuously (I made it 26 approx., as no truck can drive on water). Others had been caught with fiddled tacho's.
IMHO, any driver caught fiddling tacho's should permanently lose their License.

I keep hearing that, but I've been fined the same £60 (now £100) and 3 points for any speed over, from 81mph to 99mph. Not tried 100 yet, apparently they get very angry at three digits.

The £100 plus three points only applies if you are served a fixed penalty notice. If one's case is transferred to court the penalty ranges from that level upwards depending on the severity of the alleged offence. One site that might enhance your understanding is this one: https://www.rac.co.uk/drive/advice/legal/speeding-fines/ which is much clearer than the various government pages which contain the same information, but in a more opaque manner (typical for government information).