What they’ve found is that while the public may most fear a marauding vehicle without a driver behind the wheel, the reality is that the vehicles are overly cautious. They creep out from stop signs after coming to a complete stop and mostly obey the letter of the law — unlike humans.
So bots drive too well. Go figure.
Humans are terrible drivers. This middle phase of some driverless and some human drivers on the road can’t end soon enough.