Self-driving cars developed by Waymo need less human backup than rivals – though General Motors Co.’s vehicles are improving fast.
The Alphabet Inc. unit’s cars drove in autonomous mode for more than 352,000 miles on California public roads last year, and engineers took control just 63 times, according to a report filed to the state. Waymo and GM both disengaged their self-driving systems less than once per 1,000 miles during testing.
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