The driverless cars picked up 589 parking tickets in San Francisco and 75 in Los Angeles last year, according to a Washington Post investigation.

Waymo robot taxis in San Francisco are programmed to follow the rules of the road but still got hundreds of tickets for parking violations last year.

San Francisco is a hot spot for Waymo vehicles, which operate without a human driver, but it seems the cars don't always play by the rules.

Driverless cars racked up nearly 600 parking tickets in San Francisco last year as robot taxis favoured convenience over rules of the road.