What is the difference between simple Doppler from any Doppler speed radar?

The Doppler speed available from a Doppler radar is simply a speed value of a single highest speed target or target with the strongest return signal. This speed will vary widely as vehicles are detected and their speed measured.
In True Average Speed mode, our radars internally track individual targets on the road simultaneously, accumulate vehicle counts over a user-specified time period (e.g. 30 seconds) and then update the average speed taking into account all the traffic on the road. This gives a much more accurate picture of the traffic pattern on the road.