What does 100% mean? I ask because I think that there are useful points short of "never makes a mistake." The alternative to self-driving cars isn't perfectio

What does 100% mean? I ask because I think that there are useful points short of "never makes a mistake." The alternative to self-driving cars isn't perfection. It is humans, humans who not only vary in their peak performance, but in their context-specific performance. A car that drove better than me when I'm tired is a good thing for everyone. There's lot of talk about liability, but it seems both wrong and incomplete. One incompleteness comes up with an "accident" happens that a less-than-perfect self-driving system would have avoided. The legal system might not be willing to penalize in that situation now, but the upcoming Breathalyzer mandate is moving us that direction. One wrong focuses on "will the author of the self-driving system be held liable?" I think that the liability will go to the driver/owner, as today. If it's better than me and my insurance company is willing to insure me, then why wouldn't my insurance company be willing to insure my use of a self-driving system?