Was driving today over a bridge and someone changed lanes to fall in behind me VERY close. A loud beeping started and it sounded like it came from the back of the car. I'm assuming that the driver behind me was close enough to trigger the proximity warning - no contact occurred though. The odd thing was, the beeping didn't stop until about 2-3 minutes later after I pulled into a parking garage where the front proximity sensors were triggered by the posts at the entrance to the garage. Anyone else had a sensor go off while driving at 25+ mph? Do these things normally keep beeping even after the cars spread apart?