This is fascinating! I'm very tempted to build a "early warning door bell". Being the only house on our road, it'd be fun to try and set up a few of these to detect when a car takes the exit from the bigger road ours connects to, and give a heads up that visitors are coming!
There will be a few false positives from farmers coming to work the fields by our road, or people looking to hike in the nearby forests, etc. but it could be pretty fun nonetheless!
There will be a few false positives from farmers coming to work the fields by our road, or people looking to hike in the nearby forests, etc. but it could be pretty fun nonetheless!