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Mine has gone off a few times when backing out of a driveway with cars approaching. Seemed to work when they were a decent distance away. When driving, my car has alerted a few times and once applied the brakes. But I think you need to be going above a certain speed.
See my thread on the rear collision I had with a pole. It happened so fast I don’t recall the details. I’m sure it alerted me, but didn’t apply brakes. Thread it titled “weeks to get repairs “
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