Waymo halted Atlanta robotaxi operations after an unoccupied vehicle entered a flooded intersection and remained stuck for approximately one hour on May 20, 2026, according to company statements and local reports cited in NHTSA filings.

NHTSA recall documentation released May 15, 2026, shows Waymo deployed software restrictions limiting operations on higher-speed flooded roadways yet stated no final remedy for flood avoidance had been completed at the time of the update; the Atlanta storm produced flooding before National Weather Service flash-flood alerts were issued, the same data sources Waymo listed as primary inputs.

Separate NHTSA and NTSB investigations remain active into prior school-bus passing incidents and the January 23 Santa Monica collision, with a second NHTSA document request issued May 15 after initial redacted submissions proved insufficient.