Definition in the Oxford dictionary: "Of, pertaining to, or characterized by autonomy; self-governing, independent; free of external influence or control."
Self-driving car advertisers like Musk or Waymo just want to co-opt this term because it sounds cool. The term also deliberately hides the fact that these vehicles surveil and track you.
EDIT: It is the full definition in the printed Shorter Oxford English Dictionary (which is a large two volume publication). It is understandable that morons downvote it.
Most things aren't absolutes. This is no exception. The vehicles can operate on their own the majority of the time. That is a form of autonomy, albeit incomplete.
You are subject to road signs, traffic, police directions, etc while driving. In the event of a natural disaster it seems feasible that you could end up in a situation where you don't know how you ought to proceed. So neither are you "free of external influence or control" in an absolute sense.
In this context, I think I prefer to use this definition from the Oxford Advanced Learner's Dictionary: "(of a vehicle) that has the technology to drive itself without a person in control"
I think it fits the state of affairs well-enough.
https://www.oxfordlearnersdictionaries.com/us/definition/eng...