Don't know if that's accurate, chief. I thought the cameras didn't necessarily work in sequence and your speed could be measured between 2 or more random points. Eg: circuit of 10 cameras, speed measured between points 2/3 and maybe 6/7. Could be shite like. Me? 70. 70 tops.
That's how it works. Only two of the cameras on any stretch are on at any one time and it could be any combination as you say.