When driving on a quiet, straight road with no other cars anywhere nearby the vehicle suddenly slammed on the brakes until the car came to a complete stop. The seat belt pre-tensioners also activated and there were loud audible warning beeping and red ‘radar’ images on the dashboard. My safety was not at risk in this instance however if the same thing happened while I was being followed then I’d be a risk from being hit from behind. I frequently travel on busy interstates and it scares me to think that this could happen again. The system also activated three times when backing out of my driveway, again nothing was around. I have taken the car to the dealer, Carlton Mercedes-Benz in Greenville, SC, twice and they have failed to find anything wrong with it so made no changes. This leaves me with little confidence in the vehicle. The dealer was not forthcoming about the details of what checks they actually did. Please see above for info on the other warnings etc. that activated during the event.