In Germany, there are quite a few cars with "Emergency Assist" technology. There are different variants of it, in my VW Touran it works like this: When the car is in ACC/lane assist mode (similar to Autopilot), it will detect when there is no steering wheel input for a while. First it beeps, then it will brake a few times to "wake you up". Still no input? Then it will brake to a complete stop and turn on the warning lights. In more recent incarnations the car will park at the side of the road.

It is great for medical emergencies (stroke/seizure) but of course you should not rely on it and drive without paying attention to the road.