Interesting. My 2013 BMW vibrates the steering wheel if it thinks I'm going to move sideways into something (and that includes fast moving cars coming from behind) or it beeps loudly if it thinks I'm going to hit something in front of my based on my speed and distance of the object in front. And its highly accurate IMHO. My take on self-driving is someone needs to hook up these signals to controls on the car - the "hard part" does a reliable job.