Waymo Robotaxis Stall in San Francisco, Raising Safety and Oversight Questions

A fire at a Pacific Gas and Electric electrical substation on December 27 triggered a widespread outage across San Francisco, cutting power to tens of thousands and leaving many traffic lights inoperative. In the hours that followed, videos circulating on social media and firsthand accounts showed Waymo robotaxis stopped in live lanes and at intersections with hazard lights on, a development that compounded congestion and prompted city officials to dispatch officers and emergency crews to manage traffic.

City leaders said municipal emergency management asked residents to stay home while teams worked to direct traffic and restore services. The mayor drew a direct line of communication with Waymo as conditions worsened and the company coordinated with city personnel while temporarily pausing its Bay Area service.

Waymo acknowledged that some of its vehicles "remained stationary longer than usual" and that the scale of the outage "overwhelmed parts of its system." The company said its Driver software is programmed to treat non functional signals as four way stops. But when dozens of signals went dark across multiple intersections at the same time, vehicles spent extended periods confirming how to proceed, and some ended up immobilized in traffic lanes while the fleet manager directed cars to pull over and return to depots in stages.

Observers described the safety fallback as effectively "bricking" vehicles, because the cars did not suffer electrical failures or software crashes but entered an exceptionally cautious mode that left them stopped in situations where a human driver might have moved through the intersection under controlled direction. Waymo paused operations during the outage and resumed service the following day after directing vehicles off the road and into depots.

Company engineers said they are deploying fleet wide software updates intended to give the vehicles more context about regional power failures and to enable them to navigate impacted intersections more decisively. Waymo has also said it will improve remote support and emergency response procedures after the outage overwhelmed some of its systems.

The incident has attracted immediate regulatory attention. City supervisors have requested hearings to examine Waymo's response, and a California regulator opened a review of the stalled robotaxis. Transportation officials and former agency leaders argued that episodes like this expose gaps in existing oversight, particularly around how autonomous operators plan for large scale infrastructure disruptions, including outages caused by fires, earthquakes and storms.

Experts in autonomous systems say lessons from the blackout will be important for both companies and regulators. They point to the need for clearer standards on fail safe behavior in complex urban environments, and for requirements that fleets maintain robust coordination with municipal emergency operations during crises.

As robotaxi operators expand into denser urban markets, the San Francisco outage underscores the tight coupling between public infrastructure and automated mobility. For now, software updates and regulatory hearings are the immediate responses, but officials and industry observers say the event will likely accelerate policy debates about how to ensure autonomous vehicles remain safe and functional when the systems they depend on fail.