One of the so-called advantages of self-driving cars is that they will actually reduce accidents on the roads. As such, any accident with a self-driving car is "news." According to the MIT Technology Review, Google's self-driving cars have been involved in 14 accidents over the lifetime of the program. Although information regarding the number of cars and amount of time that they have spent on the road is limited, 14 accidents sounds relatively low.
Even so, Google representatives have stated that all 14 accidents have been the responsibility of other cars. They attribute these accidents to "distracted driving." Further, Google engineers have focused on ensuring that self-driving vehicles respond properly to abnormal situations. However, the article makes it clear that there is still progress to be made after a recent instance in which a vehicle drove continuously in circles after entering a roundabout.
“There’s been a lot of noise recently in the press about the fact that our vehicles have been in collisions,” Urmson said. “We’ve been hit 14 times over the lifetime of the program, and there’s been a bunch of speculation about that.”