What are the chances I've been done?

[Mercenary Keyboard Warrior]

Probably the most accurate way to measure your actual speed is to use mile markers on a motorway sitting at a steady 70 for a few miles with a mate with a stop watch.

Really easy if you have cruise control.

 

[Gaygle]

Probably the most accurate way to measure your actual speed is to use mile markers on a motorway sitting at a steady 70 for a few miles with a mate with a stop watch.

Really easy if you have cruise control.

You could do all of that, or you could just use a sat nav.

Those camera vans will normally clock you when you're around 100-150m away, even though they are technically capable of much further.

I tend to allow 20% maximum between the limit and the indicated speed - 10% for overread, 10% for the camera calibration.

10% for the camera calibration? You realise the lasers are, as near as makes no difference, completely accurate providing they have been calibrated, which is a requirement before they can be used.

 

[Tute]

Are speedo's so out of whack that 84 is 76?

I used to find about a 10% difference between both the cars i've had and what my Tomtom thinks. Dunno how accurate Tomtoms are mind, I assumed quite decent?

You could do all of that, or you could just use a sat nav.

Those camera vans will normally clock you when you're around 100-150m away, even though they are technically capable of much further.



10% for the camera calibration? You realise the lasers are, as near as makes no difference, completely accurate providing they have been calibrated, which is a requirement before they can be used.

What causes misreadings then? Incompetent usage? I always thought the 10% ACPO rule was to cover any inaccuracy in the gun itself?

 

[Wucked]

And you failed to recognise the fact that I posted an almost meme-type response (on these forums at least).

lel. Carry on.

Oh, I see

 

[Havana_UK]

What causes misreadings then? Incompetent usage? I always thought the 10% ACPO rule was to cover any inaccuracy in the gun itself?

It's there to give the police some discretion about whether or not they choose to prosecute.

For evidence from a speed gun/camera to be admissible in court they need to be able to demonstrate that the device is properly calibrated. They are highly accurate devices.

 

[Gaygle]

What causes misreadings then? Incompetent usage? I always thought the 10% ACPO rule was to cover any inaccuracy in the gun itself?

Misreadings? Nothing, ACPO just build in a 10% + 2mph "recommendation" to forces to only NIP people who go over this. It's partly a political decision (as there would be quite a lot of backlash if people suddenly started getting caught doing 31mph in a 30mph and partly to cover any possible defences that the speed that someone was caught doing was inside the tolerances of the laser gun.

 

[MooMoo444]

I've never seen one that far out. Assuming GPS is accurate the the most I have seen is about 3mph between indicated, so 80mph on speedo was 77 according to GPS.

Thats nearly 10%. All speedos will overread as they are not allowed to legally underread so they will always build in a little tolerance, but I can't see any motor manufacturer needing to having to go close to 10%

No.. lol

That is nowhere near 10%. 10% of 80 is obviously 8, so being 3mph out is definitely not near 10%. It's only 3.75%.

 

[Mercenary Keyboard Warrior]

No.. lol

That is nowhere near 10%. 10% of 80 is obviously 8, so being 3mph out is definitely not near 10%. It's only 3.75%.

Reading back my post was confusing I was meaning the quote above was nearly 10% not the numbers I was quoting, Should have flipped the two sentences round.