Ahh yes... but if I programmed it to take the closing speed over time and set it to = positive speed over the same amount of time taking into account the approximate deceleration rate of my vehicle I could put the vehicle back to the edge of the Dopplers range limit, therefor keeping a safe distance, depending on what the range limit is... but then what happens if a vehicle turns in front of me going the exact same speed, it wouldn't know to slow down because the only change it would have seen would have been a very very fast spike in speed if it could even notice at all. Soooooo..... I'm guessing to keep this under/at budget I may want to consider using laser and working around the problems that come up with that system.