US News | Waymo's Robotaxis Blocked Roads Amid San Francisco Power Outage Many of Waymo's self-driving cars blocked streets of San Francisco during a mass power outage Saturday and forced the company to temporarily suspend service, raising questions about the cars' ability to to adapt to real-world driving conditions. Social media users posted videos of Waymos as they encountered traffic lights that were off. Some cars’ hazard lights blinked and they abruptly stopped in place, failing to cross the intersection. Others stopped in the middle of the intersection, forcing other cars to swerve around them