A “system malfunction” has caused several self-driving robotaxis to stall in the middle of the road in China, police have confirmed, after distressed riders were stranded for hours.Local authorities in the central Chinese city of Wuhan said they began receiving calls “one after another” on Tuesday night from riders reporting that autonomous vehicles operated by the Chinese internet company Baidu had frozen.“Multiple Apollo Go cars stopped in the middle of the road, unable to move,” police said in a statement on Wednesday, referring to Baidu’s driverless taxi service. “After investigation, preliminary findings suggest the cause was system malfunction.”Baidu has a...