Yes, and this is why this is not happening anytime soon, and thus (imho) lvl3 won't happen anytime soon. What comes to mind is the 'Fifth Element' movie, scene

Yes, and this is why this is not happening anytime soon, and thus (imho) lvl3 won't happen anytime soon. What comes to mind is the 'Fifth Element' movie, scene when Bruce Willis tampers with the electronics of this cab when police is chasing him, and he's burning the little 'points' he has left. Perhaps an early implementation could be limited in specific parts (specific highways, when you are 'woken up' before the entry & exit' and the car takes over for the long stretch. A combination of transponders, sensors, magnetic beacons/'drivers' on the asphalt, GPS, radio antennas (kinda like Android/Google maps use for location). I tend to NOT buy something until proven to work. Musk is a media/marketing freak. He will tell whatever he has to, to serve his business interest. It's down to us to jump the bandwagon, OR wait calmly until the 'thing' is actually produced, tested, proven.