A Tesla with the semi-autonomous autopilot system engaged failed to brake or perform other crash avoiding maneuvers when the car could not differentiate between the side of a white trailer and the bright sky. The driver of the car also did not react.
http://www.cbsnews.com/news/this-fatality-could-slam-the-brakes-on-driverless-cars/
http://www.cbsnews.com/news/this-fatality-could-slam-the-brakes-on-driverless-cars/