A row of Google self-driving Lexus cars are parked at a Google event outside the Computer History Museum in Mountain View, Calif., on May 13, 2014.
A row of Google self-driving Lexus cars are parked at a Google event outside the Computer History Museum in Mountain View, Calif., on May 13, 2014. Eric Risberg AP
A row of Google self-driving Lexus cars are parked at a Google event outside the Computer History Museum in Mountain View, Calif., on May 13, 2014. Eric Risberg AP