Let’s say I’m driving on a stretch of some limited access highway (one with no on or off ramps). Let’s say the speed limit is 70 mph and the stretch of road is thirty-five miles long. There are cameras at the on and off ramps.
One camera records me entering the highway at 1:15 pm. Another camera records me exiting the highway at 1:35 pm. (The clocks are synchronized.)
Now if I drove thirty-five miles at a speed of seventy miles per hour, it would take me thirty minutes. I drove this distance in twenty minutes. This means I must have been driving an average speed of 105 mph. (I could have been driving slower than 105 mph at some point but that would mean I would have had to have driven at an even higher speed at some other point.)
Based on this clear objective evidence that I was driving at least 105 mph, could I be issued a speeding ticket? Or does the legal system require that I have to be observed at the specific time when I am driving over the speed limit?