The latest report showed Google self-driving car encountered 272 faults from 2014 to November, 2015. There would be 13 accidents caused without drivers assistance during the test.

According to the document that submitted to California DMV, all of the approved companies that test self-driving cars should report the every detail of accidents. The drivers can assist to fix the faults during the accident occurs.

There are 49 self-driving cars testing in California in the past 14 months, including Google Koala and refitted Lexus RX450s.

Those self-driving cars finished the test with 424,000 miles. There were 341 accidents in total. When the accidents occurred, the self-driving car could let the driver to take control or the drivers interpose the driving.

Google self-driving cars encountered 272 faults which involved in several component problems during the test, such as sensor reading errors, veer and brake system. When they encountered such component problems, the vehicle will produce voice or visible signals to warm the drivers to check.

In most cases, the self-driving cars can fix the faults by themselves instead of the intervention of drivers. Google only reported some of the accidents to the California government.

John Simpson, chief of private project from Consumer Watchdog said:” It is right that DMV demands those companies submit the accident details as it puts safety in the top place. Google reported there were 272 faults in 15 months and the drivers were forced to interpose 69 times. How could Google promote its self-driving cars without steering wheel, brake and driver? ”

VW, Audi, Benz, Google, Delphi Automotive, Tesla, Bosch and Nissan were demanded to submit their accident reports with details by Jan 1st, 2016. So far, only Google revealed its details.