Waymo Updates Software After San Francisco Power Outage Disrupts Service

A recent power outage in San Francisco caused important disruption to Waymo’s self-driving taxi service, halting vehicles and creating traffic congestion. Waymo has announced it will update it’s automation software to improve its response to similar events in the future.

The Incident: A Citywide Disruption

On December 20th, a fire at a PG&E substation triggered a widespread power outage across San Francisco. This outage disabled traffic lights, leading to a standstill for numerous Waymo vehicles at intersections throughout the city. Social media footage showed several Waymo taxis stopped in roadways, hazard lights flashing, and contributing to substantial traffic backups.

How Waymo Vehicles Handle traffic Light Failures

Waymo’s system is designed to treat a non-functioning traffic light as a four-way stop. Though, the system includes a safety check. According to Waymo’s statement, vehicles sometimes “send a confirmation request to make sure you’ve made the safest choice.”

The Scale of the Problem and Waymo’s Response

Waymo reports that its vehicles have successfully navigated 7,000 instances of traffic lights being out of service.However, the concentrated nature of this particular outage – affecting a large number of lights simultaneously – resulted in a surge of these “verification requests.” This overload contributed to the vehicles halting and the resulting traffic issues.

Software Update Planned

Waymo is actively working on a software update to address this issue. The update aims to streamline the verification process and allow vehicles to navigate widespread outages more effectively, minimizing disruptions to service and traffic flow.

Key Takeaways

• A power outage in San Francisco stranded Waymo self-driving taxis due to malfunctioning traffic lights.
• Waymo vehicles treat non-functioning traffic lights as four-way stops but include a safety verification step.
• The widespread nature of the outage overwhelmed Waymo’s verification system.
• Waymo is developing a software update to improve its response to similar events.

This incident highlights the challenges of deploying autonomous vehicles in real-world conditions and the importance of robust software systems capable of handling unexpected events.Waymo’s swift response and commitment to a software update demonstrate a dedication to safety and reliability as the technology continues to evolve.

published: 2025/12/25 00:26:48