Lex, I think that when you talk about how humans perceive probability you have to factor the legal aspects it that evaluation. For instance in the 72% hitting the bike example you have to think of how your action or inaction will be perceived in a courtroom. "The car told you there was a 72% chance you would hit the bike, why didn't you act?" How low does the level of risk have to be to remove your liability? This issue is the biggest dilemma facing self driving tech today. While Tesla is forging ahead and praying that they can continue to avoid litigation with their disclaimers, I don't expect that the "hope" that they are not going to get sued in to bankruptcy will be viable much longer. I think this is why you see the big auto companies taking it slow because, in reality, the sue crazy world we live in is holding back our technological progress.