Police in San Bruno were patrolling for drunk drivers when they observed a car traveling erratically.

But this couldn’t be chalked up to an impaired or distracted driver. There wasn’t anyone behind the wheel at all.

Officers were bewildered to see the car — a self-driving Waymo robotaxi — make an illegal U-turn at a traffic light right in front of them, the San Bruno Police Department said in a social media post Saturday.

“It was a first for both officers,” the department wrote in the post, which included photos of an officer peering through the front window at the empty driver’s seat.

Because the car did not have a human driver, officers could not issue a ticket, police noted. Instead, officers contacted the company to let them know about the “glitch,” they said.

“Hopefully the repro

See Full Page