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Camera van and dashcam disagree
stethoscope
post Thu, 1 Mar 2018 - 13:53
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I was surprised to receive an NIP in the post alleging that I had been travelling at 83mph on a 70mph NSL road and photographed by a manual camera van. I had seen the van, and was travelling in the flow of traffic. I have a GPS 'satnav' map device and a GPS-linked dashcam and so downloaded the data from both. The video clearly shows the camera van on the other side of the road, and that my speed is 69.3mph. While the satnav measures in legs of a few hundred yards rather than instantaneously it is in agreement with the dashcam.

This is where it gets interesting. The safety partnership have kindly sent two stills of the car. However, the time printed on the picture is some 30 seconds after I passed the van - and the car is about half a mile away. I asked a police friend of mine what to do, and he suggested writing to the safety partnership to tell them that I had evidence from two devices that agreed with each other but disagreed with theirs. I did so, and got a rapid reply to say that GPS devices were inaccurate and affected by the weather so they were still going to prosecute. I have returned the RK form - I was driving and that is not in dispute, but I do dispute their data. Firstly, the two devices agree with each other on time, place and speed. They have no connection with each other apart from a power supply from the car. Furthermore, while I am well aware that the speed measured can fluctuate, it depends on the number of satellites used for calculation and the variation is not great - ceratinly not 14mph for a sustained peiod. 8 satellites were being used. Even more pertinently, the timekeeping by the GPS system is incredibly accurate. The devices keep good time even when not able to see satellites, but when they can see them it is accurate to milliseconds. I'm pretty confident in the time and speed records I have and have preserved. I am minded to defend this, as something has clearly gone wrong at their end. I have no idea what, and it isn't my role to speculate. Please can I seek advice on this course of action?
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This post has been edited by stethoscope: Thu, 1 Mar 2018 - 13:53
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Posts in this topic
- stethoscope   Camera van and dashcam disagree   Thu, 1 Mar 2018 - 13:53
- - Jlc   For starters, the time of day discrepancy is not o...   Thu, 1 Mar 2018 - 14:16
- - stethoscope   Thank you Jlc - but the allegation on the NIP was ...   Thu, 1 Mar 2018 - 14:16
|- - mdann52   QUOTE (stethoscope @ Thu, 1 Mar 2018 - 1...   Thu, 1 Mar 2018 - 14:25
- - notmeatloaf   Are you sure that at no point in the time you were...   Thu, 1 Mar 2018 - 14:24
- - Jlc   Please don't go down that rabbit hole. The al...   Thu, 1 Mar 2018 - 14:25
- - stethoscope   Let's put it another way - if the time of a CC...   Thu, 1 Mar 2018 - 14:36
- - The Rookie   Still not understanding it then...... the evidence...   Thu, 1 Mar 2018 - 14:46
- - peterguk   QUOTE (stethoscope @ Thu, 1 Mar 2018 - 1...   Thu, 1 Mar 2018 - 14:53
- - StationCat   Since the range of the speed gun in the camera van...   Thu, 1 Mar 2018 - 14:56
- - mazzer   How about posting the stills of your car here so w...   Thu, 1 Mar 2018 - 15:19
- - stethoscope   Station cat - investigating now. Mazzer - They ar...   Thu, 1 Mar 2018 - 15:26
|- - Jlc   QUOTE (stethoscope @ Thu, 1 Mar 2018 - 1...   Thu, 1 Mar 2018 - 15:32
|- - mazzer   QUOTE (stethoscope @ Thu, 1 Mar 2018 - 1...   Thu, 1 Mar 2018 - 16:05
||- - Fredd   QUOTE (mazzer @ Thu, 1 Mar 2018 - 16...   Thu, 1 Mar 2018 - 16:53
|- - bearclaw   QUOTE (stethoscope @ Thu, 1 Mar 2018 - 1...   Fri, 2 Mar 2018 - 12:39
- - Pete D   Was the front or rear of the van facing you. I sus...   Thu, 1 Mar 2018 - 15:56
- - Jlc   I doubt the pictures will make much difference oth...   Thu, 1 Mar 2018 - 16:08
|- - mazzer   QUOTE (Jlc @ Thu, 1 Mar 2018 - 16:08...   Thu, 1 Mar 2018 - 16:16
- - mickR   QUOTE (Jlc @ Thu, 1 Mar 2018 - 15:32...   Thu, 1 Mar 2018 - 16:09
- - mickR   QUOTE (mazzer @ Thu, 1 Mar 2018 - 16...   Thu, 1 Mar 2018 - 16:26
- - mazzer   Or post the entire dashcam video.   Thu, 1 Mar 2018 - 16:28
- - stethoscope   OK - here are the images. Thank you for advice so ...   Thu, 1 Mar 2018 - 16:50
|- - peterguk   QUOTE (stethoscope @ Thu, 1 Mar 2018 - 1...   Thu, 1 Mar 2018 - 17:07
- - Tartarus   Not related to the case, but back on the subject o...   Thu, 1 Mar 2018 - 17:02
- - Jlc   I still think the OP has to look at their own ‘e...   Thu, 1 Mar 2018 - 17:02
- - StationCat   Those images are stills from a video. The system i...   Thu, 1 Mar 2018 - 17:03
- - stethoscope   Thank you. I have been sent an offer of an SAC (my...   Thu, 1 Mar 2018 - 17:10
- - StationCat   The time on that equipment is set manually by the ...   Thu, 1 Mar 2018 - 17:14
- - Jlc   You will have to host video externally - YouTube o...   Thu, 1 Mar 2018 - 17:18
- - southpaw82   As a matter of law the prosecution don’t have to...   Thu, 1 Mar 2018 - 17:23
- - mazzer   You were a lot closer than 251m from the van in yo...   Thu, 1 Mar 2018 - 17:23
- - stethoscope   I stated in the original posting that the vehicle ...   Thu, 1 Mar 2018 - 17:28
|- - mazzer   QUOTE (stethoscope @ Thu, 1 Mar 2018 - 1...   Thu, 1 Mar 2018 - 17:33
|- - southpaw82   QUOTE (stethoscope @ Thu, 1 Mar 2018 - 1...   Thu, 1 Mar 2018 - 17:53
- - StationCat   The ping shot shows your car directly facing the v...   Thu, 1 Mar 2018 - 17:29
- - The Rookie   Copyright arises when an individual or organisatio...   Thu, 1 Mar 2018 - 17:38
|- - mazzer   QUOTE (The Rookie @ Thu, 1 Mar 2018 - 17...   Thu, 1 Mar 2018 - 17:43
- - stethoscope   Pyecombe, A23. I think this link should work: http...   Thu, 1 Mar 2018 - 17:38
- - Irksome   The reported speed at the beginning of the clip yo...   Thu, 1 Mar 2018 - 17:54
|- - peterguk   QUOTE (Irksome @ Thu, 1 Mar 2018 - 17...   Thu, 1 Mar 2018 - 17:58
- - mazzer   251m at 70mph takes about 8 seconds. We've onl...   Thu, 1 Mar 2018 - 18:00
- - Irksome   As Southpaw points out, the allegation is that he ...   Thu, 1 Mar 2018 - 18:07
|- - notmeatloaf   QUOTE (Irksome @ Thu, 1 Mar 2018 - 18...   Thu, 1 Mar 2018 - 21:32
|- - 122basy   QUOTE (notmeatloaf @ Thu, 1 Mar 2018 - 2...   Thu, 1 Mar 2018 - 22:46
|- - notmeatloaf   QUOTE (122basy @ Thu, 1 Mar 2018 - 22...   Fri, 2 Mar 2018 - 09:10
|- - 122basy   QUOTE (notmeatloaf @ Fri, 2 Mar 2018 - 0...   Fri, 2 Mar 2018 - 09:55
|- - notmeatloaf   QUOTE (122basy @ Fri, 2 Mar 2018 - 09...   Fri, 2 Mar 2018 - 11:01
|- - StationCat   QUOTE (notmeatloaf @ Fri, 2 Mar 2018 - 1...   Fri, 2 Mar 2018 - 12:08
- - stethoscope   Thank you to all those who contributed. This has b...   Fri, 2 Mar 2018 - 08:05
- - Jlc   I presume this ‘plan’ doesn’t involve taking...   Fri, 2 Mar 2018 - 08:08
- - stethoscope   Well, my thoughts of defence have been shown to be...   Fri, 2 Mar 2018 - 09:11
|- - MFM   QUOTE (stethoscope @ Fri, 2 Mar 2018 - 0...   Fri, 2 Mar 2018 - 10:17
- - mickR   QUOTE (122basy @ Fri, 2 Mar 2018 - 09...   Fri, 2 Mar 2018 - 10:03
|- - southpaw82   QUOTE (mickR @ Fri, 2 Mar 2018 - 10...   Fri, 2 Mar 2018 - 11:36
- - Jlc   Ostensibly but searching for potential defences is...   Fri, 2 Mar 2018 - 10:27
- - mickR   QUOTE (southpaw82 @ Fri, 2 Mar 2018 - 11...   Fri, 2 Mar 2018 - 17:55
|- - Jlc   QUOTE (mickR @ Fri, 2 Mar 2018 - 17...   Fri, 2 Mar 2018 - 17:57
- - mickR   I meant the aspect of submitting potentially incri...   Fri, 2 Mar 2018 - 18:03
- - southpaw82   It’s an interesting concept: my evidence is good...   Fri, 2 Mar 2018 - 18:20
- - notmeatloaf   I am coming at this from a medical science backgro...   Fri, 2 Mar 2018 - 18:49
|- - southpaw82   QUOTE (notmeatloaf @ Fri, 2 Mar 2018 - 1...   Fri, 2 Mar 2018 - 18:50
|- - StationCat   QUOTE (notmeatloaf @ Fri, 2 Mar 2018 - 1...   Sat, 3 Mar 2018 - 14:17
|- - notmeatloaf   QUOTE (StationCat @ Sat, 3 Mar 2018 - 14...   Sat, 3 Mar 2018 - 14:36
|- - southpaw82   QUOTE (notmeatloaf @ Sat, 3 Mar 2018 - 1...   Sat, 3 Mar 2018 - 14:40
|- - notmeatloaf   QUOTE (southpaw82 @ Sat, 3 Mar 2018 - 14...   Sat, 3 Mar 2018 - 15:08
- - southpaw82   Fun as this is, the OP’s argument is pretty poor...   Sat, 3 Mar 2018 - 16:44
|- - mazzer   QUOTE (southpaw82 @ Sat, 3 Mar 2018 - 16...   Sat, 3 Mar 2018 - 17:30
- - stethoscope   It is the time element that has interested me. The...   Sat, 3 Mar 2018 - 18:06
|- - southpaw82   QUOTE (stethoscope @ Sat, 3 Mar 2018 - 1...   Sat, 3 Mar 2018 - 18:26
|- - peterguk   QUOTE (stethoscope @ Sat, 3 Mar 2018 - 1...   Sat, 3 Mar 2018 - 20:13
|- - notmeatloaf   QUOTE (stethoscope @ Sat, 3 Mar 2018 - 1...   Sat, 3 Mar 2018 - 22:14
- - IanJohnsonWS14   Is it your car in the photograph or was your car s...   Sat, 3 Mar 2018 - 18:13
- - mazzer   The Police are often equipped these days with body...   Sat, 3 Mar 2018 - 18:16
- - stethoscope   Thanks again. I am beginning to understand the dif...   Sat, 3 Mar 2018 - 23:01
|- - Logician   QUOTE (stethoscope @ Sat, 3 Mar 2018 - 2...   Sun, 4 Mar 2018 - 01:35
|- - Spandex   QUOTE (stethoscope @ Sat, 3 Mar 2018 - 2...   Sun, 4 Mar 2018 - 09:16
- - notmeatloaf   All you need to worry about is that the prosecutio...   Sat, 3 Mar 2018 - 23:51
- - Trampilot   I don't think the op has said what brand sat n...   Wed, 7 Mar 2018 - 10:40


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