SAN FRANCISCO — Police in Northern California were understandably perplexed when they pulled over a Waymo taxi after it made an illegal U-turn, only to find no driver behind the wheel and therefore, no one to ticket. The San Bruno Police Department wrote in a now-viral weekend social media post that officers were conducting a DUI operation early Saturday when a self-driving Waymo made the illegal turn in front of them. Officers stopped the vehicle but declined to write a ticket

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