[jeffbush]

How would it know to do that? I assume if he had passed out it would have just continued driving on the highway until it ran out of battery, right?

[brokenmachine]

I think they beep to warn you, then eventually stop if you don't have your hands on the wheel.

[jeffbush]

Sure enough :)

https://www.youtube.com/watch?v=Z7ojb2x2R28&feature=youtu.be