Ring 2

I've just recently installed the Ring Doorbell 2, first I love the video clarity. I was actually quite surprised at how clear it really is.I seem to be having issues with it's sensativity. I live on a very busy street and have the motion zones pulled in to minum. The street where traffic is, is about 25 feet from the Ring doorbell. I have the distance from house set at 30 feet and the motion zone at the minimum there as well, but I still get notifications every time a vehicle drives by. What am I missing?