"Sergey Brin, a Google co-founder who has taken the self-driving car and other special projects under his wing, has he wants the self-driving car to drive a million miles without an accident. The company has also patented a "landing strip" for the cars, able to orient it or transfer information to it via short-range wireless technologies."
Just to be clear, it was a human driver operating the Google car. The car wasn't operating autonomously at all when the accident occurred, so 0 accidents so far.