I got tagged for 40 in a 25 as the speed limit changed in a small town. I'm aware that the speed limit changed at the sign and was alert to that. The officer was only 200' from the 25 mph sign and I believe that what he read was my speed in the 40 mph zone. At what distance (if any) is the target too close to the the gun to get an accurate reading? At 205' I was legal at 40 mph but at 200' I needed to be at 25 mph. I believe that I was. Could he have taken an accurate reading within that 200' space?