Police officers in San Bruno didn’t have to look far for a traffic violation Friday night — a driverless Waymo pulled an illegal U-turn right in front of their patrol car.

For those officers, it was the first time they had stopped a driverless vehicle in the city, underscoring a dilemma as autonomous cars spread beyond San Francisco: when no one is behind the wheel, who is held responsible for breaking the law?

Around midnight near Huntington and San Bruno avenues, as officers were on the lookout for intoxicated drivers, the Waymo made the turn, police said. Unsure whether a human was inside — the vehicles have only recently begun appearing on city streets — officers flashed their lights and pulled the car over.

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