SAN FRANCISCO, United States (AFP) — San Francisco police faced an unprecedented problem recently when an officer stopped a car that was driving at night with no headlights on, only to discover there was no one inside. The vehicle, it turned out, was a self-driving car, and the police officer’s encounter was captured on film by a passerby, who posted the footage on social media. The clip, showing bemused officers circling the vehicle and peering […]