That's a fine micro-comparison to consider, alone! But also, what if this is a rare situation where the autonomous car completely fails compared to a human-in-

That's a fine micro-comparison to consider, alone! But also, what if this is a rare situation where the autonomous car completely fails compared to a human-in-seat? But, even this failure still resolves in under-a-minute. Or, worst-case, approximates the (quite-common) case of a breakdown or human-accident blocking traffic, in a manner that takes tens-of-minutes to resolve. In that case, who cares that we've found one narrow failure? Humans show impatience, poor-judgement, bad exception handling, recklessness, and so forth at ample rates across many road interactions. It's the net total of blockages by autonomous cars, in count & duration & severity, that matters, and specifically whether overall they do better or worse than human drivers. That net comparison is the most important consideration.