A view of traffic from above as more than 130,000 PG&E customers without power in San Francisco, California, on 20 December. nadolu/Getty ImagesA view of traffic from above as more than 130,000 PG&E customers without power in San Francisco, California, on 20 December. nadolu/Getty ImagesMass power outages affect 130,000 in San Francisco and disrupt trafficTraffic signals failed in large portions of the California city while Waymo robotaxis stopped in streets and intersectionsA widespread power failure plunged San Francisco into darkness on Saturday night, disrupting traffic citywide and forcing numerous self-driving Waymo taxis to stop abruptly in the middle of streets and intersections. As electricity went out across large portions of the city, traffic signals failed, leaving autonomous vehicles unable to operate as normal.