https://www.aph.com/community/holidays/dri...y-cameras/

Some interesting comments here about the need to suddenly brake hard as the speed sign changes from say 60 to 40mph as you approach close to the camera.
Apparently a significant % of drivers dont understand how they work.

Ive been in that situation; you are already slowing down to cross the camera at say 60 , the driver behind is also slowing but closing up and as you get close to the camera it changes to a lower speed . Do you hit the brakes to get your speed down but worry if the person behind will react fast enough or go through camera at say 50 and continue to slow to 40 but more gently, and hope you've not got a speeding fine.

Can anyone confirm whether these cameras have a delay period after dropping the speed as vehicles close to the camera will not be able to drop their speed fast enough without braking hard ?

I just set the cruise control and sit it out. Although it can get irritating when you come up to people who dont/wont use cruise control and/or cannot maintain a constant speed on inclines. Jules

I got snapped about 3 years ago on the M1 near Nottingham. I saw the gantry speed sign change from national to 60 about 3 secs before I passed under it, and got double flashed by the camera on the gantry. Clocked doing 72mph in a 60mph. So in that case there was no delay.

I travel through the road works on the M74 a couple of times a week , it's about 4 miles long with average speed cameras @50mph . The number of people that pass me when my speedo says I'm doing 50mph is unbelievable, a few even fly past. I can honestly say I'm pretty much the slowest guy going through the road works.
I know speedos vary a wee bit but even so it's ridiculous how many pass me. Do it now ! Your a long time dead !!

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Purplemadboy wrote:

I travel through the road works on the M74 a couple of times a week , it's about 4 miles long with average speed cameras @50mph . The number of people that pass me when my speedo says I'm doing 50mph is unbelievable, a few even fly past. I can honestly say I'm pretty much the slowest guy going through the road works.
I know speedos vary a wee bit but even so it's ridiculous how many pass me.

I find cruse control at 40 km/h (25 mph) in Sydney useful to prevent a government revenue fine. Procrastination, mankind's greatest labour saving device!

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In theory average speed cameras do not read instant speed or report instant speed they log your plate and time, the overhead gantry cameras attached to the regulating speed limit do, depending on hold ups you can happily do 80mph in an average speed zone so long as it's not for long and there are no instant speed cameras.
Most vehicles stop faster than they accelerate so every time you slow in the zone you will take longer to regain the speed limit, then you have to go very quickly to average the limit. The M74 is a good case, if you know where the cameras are, where you join and where you leave the motorway your speed may well be unknown to the cameras. Many commuters take advantage of this  my PC is slightly to the right of Genghis
2012 HSE SD4 In Orkney Grey now gone, best car ever.

agreed.. in theory you could drive for 90% of an average speed camera A to camera B zone at double the speed limit,

As long as the last 10% you are doing half the speed limit, then your average time between camera A and camera B will be within tolerances for the speed calculation. basic speed/time/distance calculation

However I think we have more than enough these days to deal with on the roads without having to work out which camera is recording my car and where in the average zone did I join etc etc etc

Id much rather hit the zone at near enough the right speed, sit at that speed until the cameras have finished and then continue on my merry way and my normal speeds

I used to travel the M1 everyday when they were widening the Nottingham stretch. I timed my journey before the cameras went in, and when they were in. The difference over a 25 mile stretch was only a couple of minutes at most so not worth the effort of trying to dodge the cameras.

Given that my speedo is about 2mph out, I set the cruise control at 52 on those motorway sections. Interesting to see what speed the trucks do, as they have very accurate speedos/tachographs and also the drivers don't want the points.
If I was done for speeding as the variable limit changed, as above, I'd certainly appeal the fine. Might not get anywhere though. Would a dashcam record the change? If so that might be enough evidence. Ex AA Series III LWB Safari - Gone
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I was given to understand that the average cameras work on one lane only thus by switching lanes (assuming 2 or 3 lane controlled area) you can avoid a ticket - is this an old wives tale or fact. MY 09 GS manual in Lago Grey, Wood Co arm rest and side bumper strips - now sold.

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I believe that is an old wives tale, your number and time is recorded on any camera and the software stores it, if the time difference between the recordings indicates a speed above which they will prosecute you have a lower bank balance
The variable speed camera though will record your speed, however whether your speed was higher than the new will depend on that speed recorded and the time of that speed, both your speed and the time of the speed change is recorded for the purposes of any court proceedings for or against you, they don't make that much cash out of a multitude of rebuttles on the time change without evidence. my PC is slightly to the right of Genghis
2012 HSE SD4 In Orkney Grey now gone, best car ever.

RogB wrote:

agreed.. in theory you could drive for 90% of an average speed camera A to camera B zone at double the speed limit,

As long as the last 10% you are doing half the speed limit, then your average time between camera A and camera B will be within tolerances .

jules wrote:

https://www.aph.com/community/holidays/drivers-face-526m-variable-speed-fines-smart-motorway-cameras/

Can anyone confirm whether these cameras have a delay period after dropping the speed as vehicles close to the camera will not be able to drop their speed fast enough without braking hard ?