Speed limits and 'safety cameras'

  the hick 09:29 27 Jun 08
Locked

I was thinking about this driving to Cornwall a couple of weeks ago. Many roads have speed cameras on them, presumably set to a small increment over the relevant limit. However, not all vehicles are legally allowed to drive at the limit in any event. For example, on a 60 mph dual carriageway, limit is 60 for cars, 40 for goods vehicles over 7.5 tonnes. So it seems they can 'get away' with driving at 20 mph over limit, but car may get caught for, say, 5mph over the limit. does anyone know if the cameras can check different types of vehicle, by height, maybe?

  johndrew 09:41 27 Jun 08

To the best of my knowledge the cameras operate simply on a speed of vehicle basis with no recognition of type/size.

But then, as we all know, those who drive vehicles which are limited to lower limits are all professionals and would never exceed the proscribed operating limits - would they??

  jack 10:23 27 Jun 08

Then you have no fears of exceeding any limit.
The tractor,Hay cart, Caravan - in front will ensure you will be well within set limits ;-}

  rdave13 10:34 27 Jun 08

Apparently some Gatsos can differentiate between vehicles; click here

  crosstrainer 10:41 27 Jun 08

This is done mostly on the number plate image that the camera snaps.

If any vehicle is over the limit, it takes a picture....Presumably the "differential" in types of vehicle is then checked prior to a fine being issued.

  peter99co 11:37 27 Jun 08

Do cameras have settings + of actual limit? I have seen a lot of speed advisory displays that are very accurate. A lot of the ones I encounter show 28 mph when my speedo is a 30 mph. I know my speedo is higher because the GPS also shows 28 mph
Is it written somewhere that speed cameras are + 2%-5% over the limit

  interzone55 12:00 27 Jun 08

Speed cameras do not differentiate between vehicles, they are just triggered when a vehicle passes that exceeds the set limit.

This set limit can vary, so when a motorway speed limit is dropped to 60mph, the cameras will trigger at 66mph.

Goods vehicles have tachographs, the tacho discs are checked regularly by officials from some government agency. I know these discs only show speed but not location, but any speed over the vehicle's permitted limit will be shown.

  Quickbeam 15:18 27 Jun 08

There are some cameras around with load sensors in the road to catch HGVs.

You can't be prosecuted for speeding on the retrospective evidence of a tacho reading.

  interzone55 17:08 27 Jun 08

"You can't be prosecuted for speeding on the retrospective evidence of a tacho reading."

No you can't, but the company can be fined if it's demonstrated that they tolerate / condone speeding.

I was playing around with a Honeywell ANPR system the other day and was most impressed with the technology.

We had a DVD film of cameras on a German autobahn, these cars were traveling at speeds in excess of 120mph and ANPR software managed to read and recognise the number plates in real time...

  Quickbeam 17:23 27 Jun 08

"No you can't, but the company can be fined if it's demonstrated that they tolerate / condone speeding."
More importantly, they can have their operators licence revoked for continual infrigements.

"I was playing around with a Honeywell ANPR system the other day and was most impressed with the technology."
Well, we all have one lying around at home... Don't we?

  laurie53 19:27 27 Jun 08

Average speed cameras are now increasingly being used, and I think that they can differentiate between types of vehicle.

They certainly could in Germany twenty years ago as anyone who took a three tonner, Land Rover or Escort through to Berlin can testify!

The Germans also prosecute for speeding on tachograph evidence, and for not pulling over if you have more than five vehicles behind you.

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