Google car incidents ....
The two incidents that I know of are due to human drivers ! One happened when the car was on manual control by a human driver and the other was when it was hit from behind by an human driver. I wonder what the accident rate for humans would be for one million kilometers ? One must also remember that the Google car is only a prototype.
With this kind of technology, one might envisage single flight crew aircraft where the bulk of the flying will be autonomous, perhaps supervised by ground controllers. The cockpit crew could be "summoned" by the ground controllers to take over if necessary.....