Quoted:
They are not using sat pictures to track speed. What they are doing is calculating your speed from point A to point B and using the camera's known GPS position and networked cameras to calculate it.
You are driving along. You pass camera A who reads your plate. You make a couple of turns. Go down a different road and pass camera B who reads your plate. They know the shortest route between the cameras and the speed limits on that route and calculate it takes X amount of time to travel that distance. If you show up before X amount of time they know you were speeding and issue a ticket.
-Foxxz
It;s the same system they use on turnpikes and toll roads throughout Europe to catch you speeding… they know when you passed the entry toll booth and took your ticket, they know when you reach the exit toll booth and hand over the ticket… arrive too soon, instant speeding ticket in the post.