I've been going past the roadworks between J11 and J13 of the M1 quite a bit recently and it got me thinking... how exactly do they work?
Now I know that they time you between two sets of cameras (distance over time etc). I remember reading somewhere that they cant use the cameras to take your average speed over a certain distance (2 miles I think). So my question is this...
Say that there are 4 cameras taking your average speed. Now do they work out your average speed between the first set to the second, then the second to the third and then third to the fourth? So they work out your speed 3 times. Or do they get you between the first to second, and the third to fourth? As it's a new set of cameras? Because that to me explains why you get some people burning past you.
Hoping that makes sense lol