What is an “averaging” error?
In the past there were a few motorists who thought that radar could average the speeds of two different vehicles to produce an erroneous reading however this is not true. What the radar may do is compare readings each few microseconds with other readings it has obtained over the past fraction of a second and compare them to see if they are consistent within the changes common among a moving vehicle and, if they are, display the calculated result. Mathematically the calculated result may be a fraction to several decimal points but the display will then round or average them out for the sake of simplicity. In other words a display of 42 mph may actually be 42.36451.
