Speed cameras on M25
Discussion
Its to do with the variable speed limits m8.
Been there for years. When the gantry signs are on saying "60" "50" etc, they are triggered to go off if you exceed the limit.
I dont think they are on the rest of the time though. I have certainly been past at three figure speed limits and never had a flash touch wood
Been there for years. When the gantry signs are on saying "60" "50" etc, they are triggered to go off if you exceed the limit.
I dont think they are on the rest of the time though. I have certainly been past at three figure speed limits and never had a flash touch wood
edc said:
For some reason I always thought they would flash at a real 92 mph - never tested it mind, probably some urban myth though.
I may or may not
have been past many many times at a speed higher than you indicated, allegedly, and I've never received a NIP. Of course it was the middle of the night, dry and no traffic and the signs weren't on. Bit of a third-hand story, this, but an ex-colleague of mine had a mate who was on the team that did the software for the M25 cameras.
Basically, its mostly a manual system, in that human operators look at the CCTV and make a judgement as to what limit to put up on the gantries. The software then activates the cameras a few gantries further along the road with an appropriate trigger speed.
When the limits are off, the cameras are off.
However, this could very easily be changed (i.e. the cameras could be left on with a default trigger speed without too much bother)
Basically, its mostly a manual system, in that human operators look at the CCTV and make a judgement as to what limit to put up on the gantries. The software then activates the cameras a few gantries further along the road with an appropriate trigger speed.
When the limits are off, the cameras are off.
However, this could very easily be changed (i.e. the cameras could be left on with a default trigger speed without too much bother)
mcflurry said:
My friend used to go from Bluewater (J2) to Heathrow (J13) for work in 33 mins (60 miles) every day for 9 months without a ping. He started at 4am so I guess there were no limits or traffic at the time
Hardly likely. Average speed of 109 mph for sixty miles implies he would stick out like a sore thumb.
Even more so at 4am.
Not many folks need to start work at 4:30 am.
gopher said:
I noticed today that the sign that says how many "offences" have been commited in the road works was over 7000.
when I passed during the last weekend in Feb it was over 12k - I wonder how often it is updated?
I go past it 3 or 4 times a week. Never seen it at 12k. Are you sure it was not 1200
pdV6 said:I actually was on the "team" that did the software. The "team" was one person - me. I'm afraid that the information you've given is almost total bollocks.
Bit of a third-hand story, this, but an ex-colleague of mine had a mate who was on the team that did the software for the M25 cameras.
Basically, its mostly a manual system, in that human operators look at the CCTV and make a judgement as to what limit to put up on the gantries. The software then activates the cameras a few gantries further along the road with an appropriate trigger speed.
When the limits are off, the cameras are off.
However, this could very easily be changed (i.e. the cameras could be left on with a default trigger speed without too much bother)
Each camera unit is standalone and the threshold is user-set for each speed limit including NSL. The enforcement speed is set as speed limit + threshold, where threashold is 0-99mph, so theoretically if you pass the camera at 149mph when the unit is "off" then you will likely trigger it.
The unit is basically a standard fixed-speed radar gatso with an extra computer and software that varies the speed based on the same inputs that set the matrix board and a load of logic that dictates when to enforce.
Prosecutions are made in exactly the same way as standard gatsos - two photos and a NIP.
There is no CCTV and the only ariel in the system is to receive a time signal from the Rugby Atomic clock.
watkid said:
I noticed today that the sign that says how many "offences" have been commited in the road works was over 7000.
I think the figure I saw this morning on a sign between junctions 15 and 13 (anti-clockwise) was 10767 if I remember rightly.
I was also generally aware of the variable speed limit regime on the M25, and today I saw a lot of speed camera type road markings near the gantries, but I had no idea how it worked in terms of camera activity.
Best wishes all,
Dave.
TripleS said:
I noticed today that the sign that says how many "offences" have been commited in the road works was over 7000.
I think the figure I saw this morning on a sign between junctions 15 and 13 (anti-clockwise) was 10767 if I remember rightly.
I was also generally aware of the variable speed limit regime on the M25, and today I saw a lot of speed camera type road markings near the gantries, but I had no idea how it worked in terms of camera activity.
Best wishes all,
Dave.
Ah, they must have updated it since yesterday afternoon when it was 7000k+. This could start a book on the total number of "speeders" caught by the end of the works. I bet it's near to 100k.
TripleS said:
I think the figure I saw this morning on a sign between junctions 15 and 13 (anti-clockwise) was 10767 if I remember rightly.
Agreed. It's been at that number for over a week now.
I couldn't possibly comment on how freqently they upgrade the number, but it's an electronic sign so it should be able to change at least once a second or so. Leaving it for a week rather implies its there to frighten tourists.
Nearly 11,000 speeding tickets at 60 quid a throw, thats 660,000 pounds - well trousered by the Treasury I think.
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