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Re:Google’s Self-Driving Car Project Is Losing Out to Rivals by greglindahl on Monday September 12, 2016 @11:58AM (#12480789)
Here's the language that the US Federal Government uses:

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

Re:Google’s Self-Driving Car Project Is Losing Out to Rivals by QuercusMax on Monday September 12, 2016 @12:30PM (#12481103)
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.