Robocars - Autonomous Drive, Self-driving, Driver-less cars

Most were but not all.

EDIT: Actually "12 minor accidents since 2009, not including one that happened just this week. “Not once was the self-driving car the cause of the accident,” claims Google."

There was one, but it was in manual mode:
"The only reported crash that appears to have been Google’s fault: “A Google Prius model AV operating in manual mode was involved in an accident on Charleston Road in Mountain View, CA. An employee operating the Google AV to run an errand (i.e., he was not using the vehicle to test our autonomous technology) rear-ended a vehicle that was stopped in traffic. No injuries were reported at the scene. The Google AV sustained some damage.”

http://gizmodo.com/google-will-tell-you-when-its-driverless-cars-crash-1709345808