Ring Pro motion zones not working

I have a ring Pro and the motion zones don't seem to be working. I live on a semi-major road but have the motion zones set to only cover my yard and driveway well away from the sidewalk let alone the street. But every passing car sets off the doorbell. At this point the thing is actually useless because it goes off every couple minutes. I keep scaling back the zones making them tinier and tinier and it doesn't matter. I also have the sensitivity on the lowest setting. Is my product defective or am I missing something?