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A San Francisco power outage from a substation fire halted self-driving robotaxis and caused traffic gridlock.
A power outage in San Francisco on December 20, 2025, caused by a fire at an electric substation, disabled traffic signals and halted Waymo’s self-driving robotaxis, leading to traffic gridlock as vehicles stalled at intersections.
Though designed to handle signal failures by treating them as four-way stops, the scale of the outage caused delays, and some vehicles required towing.
Waymo paused service temporarily but resumed operations by December 21, calling the event a learning opportunity to improve resilience during infrastructure failures.
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Un corte de energía en San Francisco debido a un incendio en una subestación detuvo a los robotaxis autónomos y causó atascos de tráfico.