Good question! As I left town there was a speed zone of 45 then it went to 55 and eventually to 75 outside of town.
When he lit me up I was just at the 55 mph speed zone sign and I looked at my speedometer and I was just under 55..
So, it is possible he clocked me going say 51 in a 45 but that would be speculation on my part.
Anyway, I am glad it turned out the way it did!