http://www.usatoday.com/story/money/cars/2015/05/11/self-driving-cars-california-crashes/27125655/

>Google said Monday that its self-driving cars have been involved in 11 accidents over six years. In a blog post, the director of Google's self-driving car program described all the accidents as minor, with no injuries, over 1.7 million miles of driving.

Well as long as they can leave their insurance info, I think thats good enough.