It's even more dangerous if it creates a false sense of security.

> If it can't get from A to B without a human behind the wheel, it's not autonomous.

How about if it can achieve this 99.9% of the time, but needs help very occasionally? How many nines do you need? Humans are not at 100% overall. There's no clear definition of autonomy.

It's hard to evaluate in terms of a percentage. Is that 99.9% of hours it's fine and the other 0.1% it will plow into something? That means that it will have an accident, possibly a serious one, one every 1,000 hrs. Which is probably about once a year for a lot of people.

Right. My point was that the parent poster said 'if it can't get from A to B then it's not autonomous', but the meaning of can/can't is rather complicated in practice.

Here's the language that the US Federal Government uses:

https://en.wikipedia.org/wiki/Autonomous_car#Classification

Seems like the key is providing a "sufficiently comfortable" time. To me that sounds like at least 15 seconds, but that's just a guess.