A DUI enforcement operation on the Peninsula early Saturday morning featured an unexpected twist: officers pulling over a vehicle without a driver.

San Bruno police said officers conducting DUI enforcement watched a driverless Waymo vehicle make an illegal U-turn at a light right in front of them.

Police said the vehicle pulled over as soon as they flashed their lights and sounded a siren. When officers went up to the vehicle, they were able to talk to a real person from Waymo using two-way communication inside the car.

“Since there was no human driver, a ticket couldn’t be issued (our citation books don’t have a box for “robot”),” police wrote in a post on social media. “Hopefully the reprogramming will keep it from making any more illegal moves.”

Waymo has been operating autonomous c

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