Last night I was driving up the M42 in the pouring rain, in the so-called "smart motorway" section, where the speed limits often change up and down every other gantry when it's busy. On the section just before you get to the toll road, within 2 minutes (I checked on my dashcam) the speed limits went 60,60,60,60, 50,60
Needless to say, even though it has quite hard at times in heavy rain and spray to see whether the sign reads 60 or 50, I made sure I was doing the limit, but as I went under the gantry that read 50, as the gantrys there are so close together I was probably doing about 58 at a guess, and 2 lights flashed from somewhere above, I assume the gantry. The distance between the two gantrys took about 13 seconds.
The next gantry was at 60 again just a few yards later.
I have seen elsewhere on the internet that these gantrys are notorious for random flashes, but I always thought those cameras worked on averages, in which case to be speeding I would have to have carried on at 60 from the first 50 gantry to the next one that read 60 or am I wrong? It has got me really wound up this morning to think I may have been done. Unfortunately I don't have gps on the dashcam so I can't prove the speed but I know what I was doing.
Any thoughts or should I just watch out for the postman and then argue the toss ?
Needless to say, even though it has quite hard at times in heavy rain and spray to see whether the sign reads 60 or 50, I made sure I was doing the limit, but as I went under the gantry that read 50, as the gantrys there are so close together I was probably doing about 58 at a guess, and 2 lights flashed from somewhere above, I assume the gantry. The distance between the two gantrys took about 13 seconds.
The next gantry was at 60 again just a few yards later.
I have seen elsewhere on the internet that these gantrys are notorious for random flashes, but I always thought those cameras worked on averages, in which case to be speeding I would have to have carried on at 60 from the first 50 gantry to the next one that read 60 or am I wrong? It has got me really wound up this morning to think I may have been done. Unfortunately I don't have gps on the dashcam so I can't prove the speed but I know what I was doing.
Any thoughts or should I just watch out for the postman and then argue the toss ?