Self-driving car prototypes need less human help, data show

FILE - This May 13, 2014, file photo shows a row of Google self-driving Lexus cars at a Google event outside the Computer History Museum in Mountain View, Calif. California regulators release safety reports filed by 11 companies that have been testing self-driving car prototypes on public roads on Wednesday, Feb. 1, 2017. The papers report the number of times in 2016 that human backup drivers took control from the cars' self-driving software, though companies argue such "disengagements" don't always reflect something going wrong. FILE - This May 13, 2014, file photo shows a row of Google self-driving Lexus cars at a Google event outside the Computer History Museum in Mountain View, Calif. California regulators release safety reports filed by 11 companies that have been testing self-driving car prototypes on public roads on Wednesday, Feb. 1, 2017.