Speed camera van threshold

[woppy101]

Hi, do speed camera vans round your speed up? I’m not sure if I have been done, my gps dash cam speed shows me as doing 56.2mph in a 50 about 500m away from the van when I saw him(was also possibly blocked by other traffic) so because I’m over 56 will this be rounded up to 57 and a nip issued?

[littleredrooster]

I wouldn't have thought it was permissible to round up from 56.2 to 57.

Where you saw the camera isn't necessarily where the camera saw you - were you gaining or losing speed at the time?

Were you going uphill or downhill at the time, as GPS speed has a very small error when not on the flat?

[woppy101]

It was flat and a constant speed as I had the cruise control on, I have looked at the dash am footage and the highest reported was 56.2mph, before quickly coming down to below 53mph, I always understood as prosecution happened at 10%+2, but wasn’t sure if the reported speed was rounded up

Edited by woppy101 on Tuesday 19th August 17:43

[woppy101]

Just to add when I started breaking down from 56mph I was 500m away from the camera van

[2020vision]

woppy101 said:

It was flat and a constant speed as I had the cruise control on, I have looked at the dash am footage and the highest reported was 56.2mph, before quickly coming down to below 53mph, I always understood as prosecution happened at 10%+2, but wasn’t sure if the reported speed was rounded up

Edited by woppy101 on Tuesday 19th August 17:43

The permissible error on an approved speedmeter allows a true speed of 56.2 mph to produce speed readings of between 51.2mph to 58.2mph.
So your speed of 56.2 can show a speed of 57 or more.
If the limit is 50 mph you are of course doing more than 50 mph. Use your dashcam as evidence you were not driving at 57mph will prove you were speeding.
An over-read is less likely than an under-read though.

[woppy101]

Is that on a police camera or a normal speedo?, I’m presuming 56.2 was my true speed as my speedo was saying 58, are you saying the police camera has a permissible variation?

[2020vision]

woppy101 said:

Is that on a police camera or a normal speedo?, I’m presuming 56.2 was my true speed as my speedo was saying 58, are you saying the police camera has a permissible variation?

Of course it does. I have set it out above.

[BertBert]

2020vision said:

The permissible error on an approved speedmeter allows a true speed of 56.2 mph to produce speed readings of between 51.2mph to 58.2mph.
So your speed of 56.2 can show a speed of 57 or more.
If the limit is 50 mph you are of course doing more than 50 mph. Use your dashcam as evidence you were not driving at 57mph will prove you were speeding.
An over-read is less likely than an under-read though.

No it doesn't. Only over-reading is allowed in the type-approval. And where did you get the 58.2 mph, it's 3.559% over?

And you've failed to answer any part of the OP's question

[48k]

woppy101 said:

I always understood as prosecution happened at 10%+2,

Edited by woppy101 on Tuesday 19th August 17:43

Enforcement not prosecution, hence the I in NIP

[Condado]

I will start this post by saying it has been 10 years since I was in the speed enforcement unit in the police force I worked in. As I have said previously ours was one of only a few forces in the country who actually used warranted police officers as operators in the van, and is still the case now.
So in the time I have been away tech has moved on but I believe the operations and kit used is just better not different.
The camera is set up by the operator at each site, a speed Is entered into the system which is always 10% plus 2 of the speed limit at the site.
The device is rated at + or - 1 mph of the stated speed for accuracy in the training and operating manuals, however in reality the speed recorded is correct as stated.
The system does not record mph as a “point” figure it only records a full figure number ie: 35 not 35.06 etc.
The system records everything on a data card and the speed of the offending vehicle is only captured on a trigger pull by the operator. So therefore if the operator doesn’t pull the trigger after having hit your vehicle with the laser you could do 100 mph past the camera system and although there would be footage of your vehicle no speed would be showing.
Hope that helps.

[woppy101]

So does that mean if I was doing (gps) 56.2mph it would read on the police camera as 56mph and wouldn’t be rounded up to 57mph, so may be seen as below the 10%+2 threshold?
I’m pretty annoyed with myself as I really don’t speed, I normally set my adaptive cruise control at the limit and just let the car crack on, the only thing I can think of is I have knocked the control, without noticing, the camera might not have even been able to see me, I have attached pictures of the last moment I was doing 56 and then when the van became clearly visible

Edited by woppy101 on Tuesday 19th August 20:05

[woppy101]

Edited by woppy101 on Tuesday 19th August 20:12

[Super Sonic]

48k said:

woppy101 said:

I always understood as prosecution happened at 10%+2,

Edited by woppy101 on Tuesday 19th August 17:43

Enforcement not prosecution, hence the I in NIP

What about the 'P'?

[Patio]

woppy101 said:

Edited by woppy101 on Tuesday 19th August 20:12

Quite a sly place to park the van, hiding behind that mound!

Can see why he's there, with the school on the left and hospital entrance on the right

Think of the lives saved by fining people from creeping over an arbitrary speed limit

[Pica-Pica]

Patio said:

woppy101 said:

Edited by woppy101 on Tuesday 19th August 20:12

Quite a sly place to park the van, hiding behind that mound!

Can see why he's there, with the school on the left and hospital entrance on the right

Think of the lives saved by fining people from creeping over an arbitrary speed limit

Looks pretty visible to me.

[Count897]

Entrapment, and as usual a money grabbing disgrace.

That said it looks like you were hidden behind the motorway maintenance van, so he didn’t have line of sight. Lucky escape!

[Mr Tidy]

It's a bit late now, you'll know within 14 days anyway!

But 56.2mph would still be within the 10% +2 guidance so as you weren't exceeding 57 you should be OK. Fingers crossed.

[2020vision]

BertBert said:

2020vision said:

The permissible error on an approved speedmeter allows a true speed of 56.2 mph to produce speed readings of between 51.2mph to 58.2mph.
So your speed of 56.2 can show a speed of 57 or more.
If the limit is 50 mph you are of course doing more than 50 mph. Use your dashcam as evidence you were not driving at 57mph will prove you were speeding.
An over-read is less likely than an under-read though.

No it doesn't. Only over-reading is allowed in the type-approval. And where did you get the 58.2 mph, it's 3.559% over?

And you've failed to answer any part of the OP's question

You are just making it up now.

7.7 of speedmeter handbook:
“… The speedmeter shall give a positive error no larger than 2 mph (or 3% above 66 mph) and a negative error of no greater than 5 mph or 10% above 50 mph…”

Link: https://www.gov.uk/government/publications/speedme...

Of course everyone can follow your crap or look at the official handbook related in simple terms by me above. I’m sure you are out of your depth and expertise.

[Tony1963]

How accurate is GPS speed now? I seem to remember a few years ago there were a few variables that could mean quite a variation in readings.

[2020vision]

woppy101 said:

So does that mean if I was doing (gps) 56.2mph it would read on the police camera as 56mph and wouldn’t be rounded up to 57mph, so may be seen as below the 10%+2 threshold?
I’m pretty annoyed with myself as I really don’t speed, I normally set my adaptive cruise control at the limit and just let the car crack on, the only thing I can think of is I have knocked the control, without noticing, the camera might not have even been able to see me, I have attached pictures of the last moment I was doing 56 and then when the van became clearly visible

Edited by woppy101 on Tuesday 19th August 20:05

Speedmeters that have no decimal places truncate the value:
56.0 to 56.9 will show 56

Speedmeters that show 1 decimal place truncate at the single decimal place:
56.90 to 56.99 show 56.9