Night time is difficult for notification alerts. Any lights from the cars is going to trigger motion in zone A. I'm not sure you can't filter that out reliably, without accidently filtering out something you actually want to be alerted on.
TBO, I have given up on live alerts because of all the false positives. Shadows, Clouds, Trees blowing, headlights, etc, etc. Every time I've tried to filter out unwanted activity, I always also accidently filter out wanted actibvity. It's a very fine line, and sometimes very difficult to get only 100% positive alerts.
My philosophy is that I'd rather have 100% of the real positive alerts, and a few false positives, then no false positives but missing real positives. If that makes sense...