Average speed checks

Deadly Ferret · 12 Dec 2014 at 00:01

I have never met anybody who has received a ticket for these. Have you?

robinbanks · 12 Dec 2014 at 00:09

don't think they really work. each time i went to Birmingham for my last job people would overtake when i was doing the listed speed. And i was going buy the sat nav! that or they must have it set to more than 10% for them.....

geekman · 12 Dec 2014 at 05:14

I've met several people who've got tickets from them - do a search on fightback forums and there's loads of threads where people have been caught out.

Akagi · 12 Dec 2014 at 06:13

I've heard that they don't bother with anything under 87MPH or something like that, which would probably be an indicated 90+ on the average car speedo.

geekman · 12 Dec 2014 at 06:44

Acme said:
I've heard that they don't bother with anything under 87MPH or something like that, which would probably be an indicated 90+ on the average car speedo.

Completely untrue, especially when you consider the limit on most average speed sections is 50/40. Even in a 70 limit you would most definitely get a ticket for 87.

Frozennova · 12 Dec 2014 at 07:22

Caught through the average section on the A14 near the M6 through the road works.

63 in a 50.

I was told any average speed cameras covering Road maintainance areas are switched on at my speed awareness course

Howard · 12 Dec 2014 at 07:46

Acme said:
I've heard that they don't bother with anything under 87MPH or something like that, which would probably be an indicated 90+ on the average car speedo.

I've heard that they shoot big lasers at you if you're doing over 87MPH.

Maccy · 12 Dec 2014 at 07:46

I can think of a well known figure on these forums who's been done by them

SDK^ · 12 Dec 2014 at 07:48

Howard said:
I'e heard that they shoot big lasers at you if you're doing over 87MPH.

I also heard the same if you drive 10% under the speed limit.

Dogbreath · 12 Dec 2014 at 08:27

SDK^ said:
I also heard the same if you drive 10% under the speed limit.

You are legally permitted to use automatic firearms against any car driver that travels so slowly that they cause HGVs to overtake them on a DCW or motorway.

if I was prime minister

almoststew1990 · 12 Dec 2014 at 08:39

How do maintenance average speed cameras work? Do they use the time taken to cover the distended between two camera to calculate an average speed, or do they simply measure your speed 2/3/4 times and average that?

Howard · 12 Dec 2014 at 08:57

They measure the time taken to drive between two cameras. You could drive past each camera at 100mph and then slow down to <whatever speed is required to average it out, 20 oddmph?> and you'd be fine.

Skilid · 12 Dec 2014 at 09:32

Surely it isn't worth the risk, regardless?

I still laugh at people that slow down to 50mph for the camera, then speed up again like they would a normal speed camera.

EdwardTeach · 12 Dec 2014 at 09:47

I always try and maintain the speed limit. If anything i err on going slightly slower as I dont have cruise control and will sometimes slip above. I notice that the last camera is usually pointing in the opposite direction, I assume this is to catch people who speed up after the last camera before they have technically left the speed restriction.

Havana_UK · 12 Dec 2014 at 10:05

Deadly Ferret said:
I have never met anybody who has received a ticket for these. Have you?

Yes, many people.

The cameras use ANPR (automatic number plate recognition) and time-stamp each vehicle as it passes. Because the positions of the cameras are known and the distance between each is known your average speed is calculated between each camera.

pepsilol · 12 Dec 2014 at 10:08

In my dream I accidentally went though a 40 zone roadworks at 55 GPS and didn't get done. Not sure what the deal was with that.

Frozennova · 12 Dec 2014 at 11:05

Howard said:
They measure the time taken to drive between two cameras. You could drive past each camera at 100mph and then slow down to <whatever speed is required to average it out, 20 oddmph?> and you'd be fine.

it also isn't as simple as the distance between each two cameras, it's totally random between which cameras they take your average between

stoofa · 12 Dec 2014 at 12:31

robinbanks said:
don't think they really work. each time i went to Birmingham for my last job people would overtake when i was doing the listed speed. And i was going buy the sat nav! that or they must have it set to more than 10% for them.....

And that tells us that nobody got a ticket as you then went on and contacted each of the people who overtook you and asked them?

Chuk_Chuk · 12 Dec 2014 at 13:58

Howard said:
They measure the time taken to drive between two cameras. You could drive past each camera at 100mph and then slow down to <whatever speed is required to average it out, 20 oddmph?> and you'd be fine.

Just to add to this, from what I heard, its any two cameras not necessarily in a row.

jono_astra · 12 Dec 2014 at 16:20