I experienced two instances of a sudden jolt and LOUD alarm while driving into town yesterday. The first was in response, I guess, to a large truck in the opposite lane moving toward me.(This was a two lane blacktop road with clearly marked lanes) The second was in response ot a bicyclist in the passenger side lane. I had seen the biclyist and already moved as far to the left as I could. To move any. further would've put me into the oncoming traffic. The noise shocked me and rattled me temporarily. Not a safe situation, in my opinion. Both alerts seemed to have been unnecessary. Has anyone else experienced similar loud alerts?