Police in California stopped a car after seeing it do an illegal U-turn - only to discover it was driverless.

The Waymo was spotted making the manoeuvre "right in front" of officers at a light, San Bruno Police Department said.

"Since there was no human driver, a ticket couldn't be issued," it said, adding officers cannot book a "robot".

There was "no driver, no hands, no clue", the police department quipped, describing the experience as coming with a "plot twist".

The vehicle pulled over as soon as officers flashed their lights and sounded a siren.

They were then able to talk to someone from Waymo using equipment inside the car.

The police department said it was hopeful "reprogramming" would stop the vehicle from making any more illegal moves.

Legislation is being prepared to enabl

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