From what I've seen, the multiple target radar units produce different tones, they have audio and visual indicators to assist in tracking multiple targets, along with the ability to track both directions. In most cases the LEO will only track in one direction, and what happens( from my understanding) the cars going in his same direction will be masked, or not even seen, at some settings, he then only sees oncoming traffic, and depending on the distance between targets, the unit he has, he can get an exact reading. I've seen this, and a good LEO can quickly identify the speed of the different cars.
Don't get me wrong, I'm not trying to defend the LEO, Just to explaing how some of the units work..There has been time they got me and I'm thinking, I was NOT going that fast.. But, once in front of a judge, he quickly asked if I was going over at all....and I was going over
So the judge agreed and I had to pay the ticket + Good Luck,
BAT