Barry, correct me if I'm wrong, but isn't speed, obtained from a 'certified' speedometer, admissible as evidence in courts.
Yeah, at least it used to be.
Lawyers kinda tore it up though, because a lot depended on the officer depth perception, distance behind the speeding car, distance the car was paced...
Probably the most unreliable of speed calculations used when writing speeding tickets.
Another way they clocked speeders was VASCAR... Calculating speed by time between known distance.
Those aircraft calculated speeding tickets raked in lotsa money too.
