Different types of autonomy get different classifications: https://en.wikipedia...#Classification
Lots of cars now do Level 1 stuff like parking assist or adaptive cruise control and something like a Tesla would be classed as Level 2. I'm very cautious about tech which ends up leaving the human responsible for whatever happens while allowing them to direct their attention elsewhere. Basically I'm not interested in a self-driving car until they reach Level 5 and I can legally get into it drunk and say 'take me home'. That's when it gets useful.
Assuming your can actually get those words out when drunk
TBH I assume you could put the car into autopilot and then jump into a passenger seat... would then be very hard to prove who the "driver" is/was in case of any law breaking behaviour whilst in auto pilot mode