TL;DR
Waymo has issued a recall for 3,791 autonomous vehicles after a robotaxi drove through a flooded road, despite detecting the water. The recall highlights challenges in autonomous vehicle safety during extreme weather. No injuries occurred, but the incident impacts Waymo’s expansion plans.
Waymo has recalled 3,791 of its autonomous vehicles after one of its robotaxis drove through a flooded road, despite detecting the water and reducing speed, according to documents filed with the National Highway Traffic Safety Administration. The recall affects vehicles using Waymo’s fifth and sixth generation systems, as the company works to address the issue. No injuries have been reported.
In a filing with the NHTSA, Waymo stated that an unoccupied robotaxi encountered a flooded section of roadway with a 40 mph speed limit. Although the vehicle detected the flood and slowed down, it continued on the route. The company is currently developing a remedy, which includes updating weather-related constraints and vehicle maps to prevent similar incidents.
This is the first recall of Waymo’s sixth generation system, introduced earlier this year, which is intended for high-volume production. The fleet affected includes vehicles equipped with this latest technology, as well as older models using the fifth generation system first deployed in March 2020. The fifth-generation system has previously been recalled five times for other safety issues.
Why It Matters
This recall underscores the safety challenges faced by autonomous vehicle companies when operating in adverse weather conditions, especially as Waymo plans to expand into regions with more unpredictable weather, such as the East Coast. The incident raises questions about the readiness of current autonomous systems to handle extreme weather events, which could impact public trust and regulatory scrutiny.

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Background
Waymo has primarily operated in warmer, drier climates like Phoenix, Los Angeles, Atlanta, and Austin, where extreme weather is less common. As the company aims to expand into cities like Boston, New York City, and Washington, D.C., the ability of its vehicles to safely navigate flooded or otherwise altered roads becomes increasingly critical. The incident marks a significant test of Waymo’s safety protocols amid its broader growth strategy.
“We are actively working on a solution to improve vehicle performance in adverse weather conditions and will update our constraints and maps accordingly.”
— Waymo spokesperson
“This incident highlights the importance of robust weather detection and decision-making algorithms in autonomous vehicles, especially as they move into more challenging environments.”
— Transportation safety analyst

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What Remains Unclear
It is not yet clear how widespread the issue is beyond the affected vehicles or whether other weather-related incidents have occurred but remain unreported. The specific technical shortcomings in the vehicle’s flood detection and response systems are still under investigation.

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What’s Next
Waymo is expected to release a software update to improve weather-related decision-making and map accuracy. The company will likely conduct further testing in varied weather conditions and monitor the fleet for additional incidents as it prepares for expansion into regions with more extreme weather patterns.

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Key Questions
What caused the Waymo vehicle to continue driving through the flooded road?
According to Waymo, the vehicle detected the flood and reduced its speed but did not fully recognize the road as untraversable, prompting the recall and system update.
Are there any safety risks to passengers or pedestrians?
No injuries have been reported, and the incident involved an unoccupied vehicle. However, the situation underscores potential safety risks if vehicles are unable to correctly assess road hazards.
Will this affect Waymo’s plans for expansion?
The recall highlights the need for improved weather handling capabilities, which will be critical as Waymo moves into regions with more adverse weather, but it does not halt their expansion plans.
How will Waymo prevent similar incidents in the future?
The company is working on software updates that will enhance weather-related constraints and improve map accuracy to prevent driving through flooded areas.