I just can't imagine relying on something like that for my safety. I have worked on GPS and IoT solutions in related spaces and the comms networks aren't reliable, and actual control of a consumer vehicle is about the last thing I would ever want relying on it.

I think if I might be critical, the idea that the car graciously hands over control to you at a moment you are capable of catching might be a bit of a blind spot. The car could lose one of the signals it needs at an inopportune time and you would need a split second and correct emergency reaction to not spear off the road or collide with something. The physics of cars at highway speeds is awe inspiring, problems happen really, really fast.