Forward Facing pretty much means they're waiting for you to pass to get a reading right? As in they're pointing close to the same direction you are going down the road right.
Can it still get a reading on whats coming from behind? - I know there is that 1 radar unit that bassicly has two built in one and has arrows and can pick up 2 at once but for that unit wouldn't the signal be just as strong from either direction?
Just not totally sure.