Google's self-driving cars had 13 near-misses in which the vehicle would have crashed without intervention from their human test drivers.
So far the cars have not caused a single accident on public roads, but new figures reveal that there have been a number of close calls.
Between September 2014 and November 2015 there were 272 "failures" reported and 13 incidents in which the cars came close to crashing.
The 272 failures reported refer to the car detecting technology failures, and notifying the driver to take control of the car.
California offers permits for the testing of self-driving cars on public roads.
However one of the conditions is that firms report every "disengagement" - moments in which a human driver had to take control of the vehicle for safety reasons.
Google is the first company to share its data publicly, despite lobbying hard against the regulation.
At the time Google's director of safety Ron Medford said: "This data does not provide an effective barometer of vehicle safety. During testing most disengages occur for benign reasons, not to avoid an accident."
During the 14-month reporting period, 49 self-driving cars travelled 424,000 autonomous miles.
Google noted that failures were becoming less and less common over the reporting period.
The company has been testing its autonomous cars since 2008, but data from the period up to September 2014 has not been released.
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