In a recent development, Waymo announced the rollout of a software update aimed at enhancing how its robotaxis navigate intersections with non-functional traffic lights, particularly during power outages. The update follows a notable incident over the past weekend when several of Waymo’s self-driving vehicles experienced challenges at intersections in San Francisco amid a citywide blackout.
According to Waymo, the robotaxis are programmed to treat disabled traffic signals as four-way stops, mirroring standard human driving behavior. This functionality was designed to maintain safe operations during outages. However, during the recent blackout, many vehicles triggered a “confirmation check” with Waymo’s fleet response team to verify their actions, leading to significant congestion, as seen in various videos shared online. The company cited a “concentrated spike” in these requests given the scale of the power outage, which ultimately exacerbated traffic conditions.
Waymo originally implemented this confirmation request system out of caution during the initial stages of their deployment. However, the company has recognized that this approach needs refinement to effectively handle larger-scale outages. In the blog post detailing these changes, Waymo stated, “While this strategy was effective during smaller outages, we are now implementing fleet-wide updates that provide the self-driving software with specific power outage context, allowing it to navigate more decisively.”
The forthcoming software update aims to integrate additional contextual information about regional outages into their self-driving algorithms. Additionally, Waymo plans to enhance its emergency response strategies by learning from the difficulties encountered during the recent incident.
Despite the problems faced by some vehicles, Waymo noted that its robotaxis successfully navigated over 7,000 instances of dark signals throughout the day of the outage. The company emphasized that managing a scenario of this magnitude posed unique challenges for autonomous technology.
This incident adds to the growing list of challenges Waymo has faced in developing a reliable fleet of self-driving vehicles. The company previously issued multiple software updates to ensure its robotaxis can properly respond to stopped school buses, which sparked an investigation by the National Highway Traffic Safety Administration and resulted in a recall. The ongoing adjustments and updates reflect the complexities inherent in refining autonomous vehicle technology.
