3 ms·

It's pretty clear the they meant "distance driven in ordinary conditions where humans normally drive cars".

• bluGill 6y ago
  That isn't the case though. Gm and Google both tell you that their incidents per mile (I think they use 100000 miles or something) is constant, because as they get better they test in harder situations. A automatic car on a desert freeway (no traffic) is easy compared to freezing rain during the afternoon rush hour in Minneapolis. (afternoon implying most people were out and so the decision to stay home isn't available). That is just on hard situation that comes to mind, I think those doing self driving cars know of others.