SJ
Member Since: 24 Mar 2009
Location: North Yorkshire
Posts: 234
  
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I recently went on a trip to the North of Scotland and as anyone who's ever driven up the A1 & A9 all the way North will know that the Scotish plod love to install speed cameras and sit around in "Safety" vans all day. So I always have my Road Angel plugged in to get some adavanced warning of these things.
However I noticed that there was a 3mph difference between what the Road Angel was telling me and what the speedo both analogue and digital were displaying. The D4 readings were faster. I've had a Road Angel for quite a while now and used it all the time in the D3 without ever recording any differences. I had just put on a brand new set of General AT's, but as far as I'm aware that shouldn't have made any difference. Anyone else had this speed difference?
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 24th Feb 2012 3:17 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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Your speedo (and most others) can display a greater speed but not less than the true speed
Quote:the indicated speed must not exceed 110% of the actual speed, plus 6.25 mph.
 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 24th Feb 2012 3:28 pm |
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APL
Member Since: 14 Sep 2011
Location: Europe
Posts: 1130
 
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Isn't there a button one is supposed to press somewhere (on the touchscreen Nav menu) after tyres have been changed?..... 2016 Discovery 4 Commercial
2019 Discovery 5 HSE
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| 24th Feb 2012 3:55 pm |
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D4mation
Member Since: 29 Jul 2011
Location: Ruralshire
Posts: 593
 
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My speedo is 2 to 3 mph faster than my Tomtom. MY12 D4 HSE Ipanema Sand
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| 24th Feb 2012 11:47 pm |
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nigel207
Member Since: 26 Mar 2009
Location: Nottinghamshire
Posts: 1344
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Most (although not all) manufacturers speedo's read fast for perhaps obvious reasons. They are allowed to be up to 10% out, hence the 10% + 2 ACPO guidelines on speeding. Strangely the D3 I have has possibly the most accurate speedo I've ever had; it's almost bang on.
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| 25th Feb 2012 12:39 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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nigel207 wrote:Most (although not all) manufacturers speedo's read fast for perhaps obvious reasons. They are allowed to be up to 10% out, hence the 10% + 2 ACPO guidelines on speeding.
The C&U regs state an allowance of 110% + 6.25mph so if your true speed is 50mph your speedo can say up to 61.25mph  ...and don't forget that the ACPO guidance is based on your true speed on a calibrated deivce not what your speedo might say so if your true speed was 50mph then the ticket guidance might kick in at 57mph ....but a true speed of 57mph might show as much as high as 68.95mph on your speedo  Confused ...you will be  21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 25th Feb 2012 1:29 pm |
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Hairy Dan
Member Since: 19 Jan 2011
Location: Co. Durham
Posts: 12319
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About 5 weeks ago I came across a cash generator van early one Sunday morning  It was just over the crest of a hill after a long downhill section, as I saw the van I looked at my speedo: 40mph   and I braked and passed the van. On returning home I reviewed my Blackvue footage, that said I was doing 36mph when I could first see the van Although it's been 5 weeks tomorrow since it happened I'm still waiting for the ticket.  (Yes I know they are supposed to be issued within 14 days) Cheers Ian
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Club N.E.R.D.S
Kielder 4x4 Safari
Discoless
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| 25th Feb 2012 1:57 pm |
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DSL
Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72786
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You'll be fine (excuse the pun), the plod/operator was prob snoozing. 
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| 25th Feb 2012 2:01 pm |
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dangerdave
Member Since: 23 Nov 2010
Location: <>
Posts: 4495
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Admin note: post content removed at user request
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| 25th Feb 2012 2:04 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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I know that Dave thats why I said DG wrote: then the ticket guidance might kick in
 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 25th Feb 2012 3:39 pm |
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nigel207
Member Since: 26 Mar 2009
Location: Nottinghamshire
Posts: 1344
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DG wrote:nigel207 wrote:Most (although not all) manufacturers speedo's read fast for perhaps obvious reasons. They are allowed to be up to 10% out, hence the 10% + 2 ACPO guidelines on speeding.
The C&U regs state an allowance of 110% + 6.25mph so if your true speed is 50mph your speedo can say up to 61.25mph ...and don't forget that the ACPO guidance is based on your true speed on a calibrated deivce not what your speedo might say so if your true speed was 50mph then the ticket guidance might kick in at 57mph ....but a true speed of 57mph might show as much as high as 68.95mph on your speedo Confused ...you will be
Yes, a true speed is always used, so if prosecuted, and personal honesty kicks in, the speed quoted is always likely to be under the speed you thought you were doing. In a previous life, I never had anyone argue over speed when considering prosecution.
Despite local discretion or not, should anyone be prosecuted for anything under the 10%, challenge it.
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| 25th Feb 2012 7:05 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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nigel207 wrote: In a previous life,
Ah ...sorry.... not trying to teach you how to suck eggs 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 25th Feb 2012 7:46 pm |
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dangerdave
Member Since: 23 Nov 2010
Location: <>
Posts: 4495
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Admin note: post content removed at user request
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| 25th Feb 2012 7:54 pm |
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nigel207
Member Since: 26 Mar 2009
Location: Nottinghamshire
Posts: 1344
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Not at all DG, and it wasn't taken that way. I don't profess to know everything and never will. I'm now a pensioner, although too young to get a bus pass! 
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| 25th Feb 2012 8:50 pm |
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DSL
Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72786
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DG'll lend you his. 
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| 25th Feb 2012 9:09 pm |
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