The purpose is that you know when the mailbox actually opened, not just when any vehicle approaches. As I mentioned above, I put a Wyze motion sensor in the back of the mailbox. It works flawlessly and is not in a position to get bumped or knocked off by the mail carrier. It is about 100 ft from camera with the bridge, which also takes a video (through the front window) of the event so I can confirm that it was actually the mail carrier that opened the box. This will work with wooden or plastic mailboxes. If your mailbox is metal, you’ll probably have to use one of the tricks listed here to get the sensor antenna visible to the bridge.
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