speed accuracy

[Skippy]

stevex9 seems to be contradicting himself here.

[gingernut777]

[Andy_P]

Time for a chill pill, Guys? 8)

[stevex9]

Hi guys

SKIPPY - It would appear that what you state from ACPO and what i say are synonymous.
Also, can you evidence that the white blocks are used for what you suggest.

If you are so knowledgable of VASCAR, you will be aware of how many ways fixed points and other points on the road can be used. Yes the police do sometimes use the white boxes for start and finish reference points, but they are not put there just for that reason. There are some near where i work and they are used for training purposes.

I can assure you that i am not winding YOU or anyone else up.

GINGERNUT - I will go one better than give you my personal details, if you are in the south east part of the UK, then i will gladly be able to visit you for a coffee with one of the advanced squads when i am teaching them and i will bring everything with me.

I have just spoken to the local Highways department who tell me that the white boxes are put there by their 'Utility facilities department' They indicate where they have different facilities, i.e. Water or other items and they sometimes use different colours. (Quote from the county council).

For impersonating a police officer see; (Section 90 Police Act 1996)

Anyway, have a good day guys...

Stevex9

P.S. - Don't drive too fast....







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[JLee]

Thanks for the info Steve. Some people on this forum are just too cynical at times, but I for one am grateful for some straight forwrd helpful information. I'm no fool and it was obvious to me that you know what you are talking about unlike some people here who seem to think that something they read on a web site somewhere must be true. I agree with your point about those 2 web sites - clearly they were not from official sources and some of the information given in them was obviously dubious. Even I could see that!

[mike_d]

What are the white markings? Is this official enough?

http://www.cheshire.gov.uk/roads/FAQs.htm?wbc_purpose=Basic%23%23%23%23%23%23%23%23

and search down the page for Vascar.

Mike

[Skippy]

[JLee]

Skippy you need to read what steve said more carefull. In relation to white boxes he said tehy were put there for reasons unknown. He later gave an example of what they are used for (sometimes by the police for start and finish reference points). He never said they were put there for that reason.

[Skippy]

[JLee]

Maybe so but you tried to make out that he was backtracking which he wasn't.

[Wannabyourhero]

always wondered what those white blobs were for - the mapping explanation sounds the most interesting. Did this start out talking about speedo accuracy - My C4 seems to read just 1mph over at all times, be interesting to see how that alters as the tyres wear down.
How accurate are those things at the side of the road that tell you your speed. I pass ones near me at the regulation 50 and sometimes they flash and sometimes they don't. They all should have a smiley face otherwise huge temptation to increment speed by 1 mph every day until they light up but very irritating to be branded a speeder of 31 mph when I'm only doing 29mph.

[Skippy]

[slash909]

yup same with mine. Speedo is about 7-8% over the GPS, but trip meter is within 1% on distances.

Tyre wear will affect this of course; mine are quite new so I expect the actual speed will read higher over time, and the trip meter will gradually drift out.

You'd have thought speedo's could be made better than 10% accurate though. Even analogue ones

I also noticed that the average speed on the trip is lower than the speedo but same as the GPS (tested at fixed speed using cruise control over a few miles of motorway). So the trip seems pretty accurate.

Next time I see one of those annoying light-up speed signs, I'm going to test it against the GPS value to see where it lights up. They are usually right on the limit unlike the cameras which are over.

Stu

[makeyourself]

So basically what this amounts to is that I can go through a speed camera with my GPS reading bang on the speed limit (therefore about 5-7mph over my speedometer) and it is guarenteed that the camera will not flash (provided I am not travelling up or down a steep gradient) and that I am not exceeded the speed limit.

In a hypothetical situation of course the speed camera will not even clock you unless you were exceeding the speed limit by at least 5 mph so in fact you could go about 5 mph over the GPS given speed and you should be OK (not that I would, just that people obviously accidently stray over the speed limit )

Hello by the way, I am new here.

[Wannabyourhero]

does anyone know what the delay is between a variable speed limit being posted on the M25 and the cameras acting on it. Last week I was tootling along at 70mph when right in front of me up pops a 50 limit. I lost the 20 mph quickly enough but I don't suppose the big lorry behind me was too impressed.
Often wonder who posts these limits - more than once I've seen 60 - 40 - 20 for the three lanes - so if you're on the inside are you supposed to drop 50 mph or do a quick lane change and only have to slow down 10. Human nature being what it is everyone heads for the outetside lane which gts interesting as 3 lanes try to get into one. Dropping from 70 to 20 at night when the M25 is pretty quiet is asking for an accident. Suspect these limits are posted by someone who never drives.
Would be nice to get a reply from a trafiic policeman but of course you don't seem to exist any more on the M25 - all replaced by less well trained but no doubt cheaper Highways Agency bods.

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