One of Google's self-driving Lexus RX450h sport-utilities was attempting to make a right-hand turn at an intersection, but was blocked by sandbags placed around a storm drain. The self-driving car began to move into the lane to its left to circle around the bags, only to find a municipal bus approaching from behind. The Google car's operator assumed the bus would move aside to allow the Lexus into its lane.
At the time of impact, the bus was moving at an estimated 15 mph, while the Google Car was traveling at a meteoric 2 mph. None of the humans involved were injured in the crash, but the Google Car incurred damage to its left front end; a couple body panels were banged up, along with one of the sensors the car uses to navigate traffic.