I had a friend ask me what our car will do should a person fall asleep at the wheel on the highway with Driver Assist Pro turned on. In the same vein...what happens in a medical emergency like a heart attack. My hope would be the car would pull into the shoulder and put on the flashers. In an medical emergency, also notify 911 though I'm guessing that's not quite there yet. I hope it doesn't just stop in the middle of the highway.