Well, dang. Figured I'd finally be able to point my cameras at a wide swath of my driveway and exclude the adjacent sidewalk and street. Worked great, no false alarms by pedestrians or passing traffic. Awesome!
Until a few nights later when someone drove by in the middle of the night. After they passed the moving reflection of their tail lights was picked up by the cameras as motion. Smack in the middle of the glass on the driver-side door of our car parked in the driveway. An area we specifically want to monitor.
So now I've gotta figure out a whole 'nother set of angles that won't include reflected lights from vehicles passing.
I've got another one down in my workshop that trips when anyone passes along outside and breaks the light from a floodlight from a neighbor's house. Just enough shadow passes the door to trip it.