Car with level 2 autonomy, 2018 Volvo S90 with Pilot Assist. You still have to pay attention to the road when driving, but long highway drives (which I take a LOT of) are a hell of a lot less tiring. I've been able to do 6 hours in a single day and it's almost like riding a personal train except for when you get to jams, local roads, or merges/exits.