Waymo explains why its robotaxis got stuck during the SF blackout

Waymo is rolling out a significant software update aimed at improving its robotaxis' ability to navigate through disabled traffic signals during power outages. This announcement comes following a recent incident in San Francisco where the autonomous vehicles encountered difficulties at intersections during a city-wide blackout over the weekend. In a detailed blog post, the company explained that its robotaxis treat inoperative traffic lights as four-way stops, similar to human drivers. This protocol was expected to allow the vehicles to operate normally despite the widespread power failure. However, many robotaxis initiated a 'confirmation check' with Waymo’s fleet response team to validate their actions, leading to unexpected congestion that was captured on video. Waymo noted that this confirmation request system was implemented to ensure safety during the early phases of deployment. However, the company recognized that it needs to adapt this approach to better align with the scale of their operations. They indicated that the recent outage caused an unusual increase in these requests, which contributed to traffic delays. To enhance performance during such events, the upcoming software update will incorporate specific context regarding regional outages, enabling the vehicles to navigate more effectively. Additionally, Waymo plans to refine its emergency response protocols, drawing insights from this incident. While the focus has been on the challenges faced during the blackout, it's worth noting that Waymo's robotaxis successfully navigated over 7,000 intersections with dark signals throughout the day. The company acknowledged that managing an event of this scale presents unique challenges for autonomous vehicle technology. This incident is just the latest in a series of adjustments Waymo has made as it continues to identify and resolve issues within its self-driving system, including prior updates related to school bus protocols that led to a National Highway Traffic Safety Administration investigation and a subsequent recall.