Waymo is recalling 3,791 robotaxis in the United States after federal regulators identified a software flaw that could send the vehicles into flooded roads at higher speeds, the National Highway Traffic Safety Administration said on Tuesday . The recall covers vehicles running both the fifth- and sixth-generation Waymo Driver, the Alphabet unit’s automated driving system. The NHTSA said Waymo has tightened its weather-related operational limits and refreshed its maps as an interim measure while engineers work on a permanent software fix. A full remedy is still under development. The recall traces to an incident on 20 April in San Antonio, when an unoccupied Waymo encountered what the company’s NHTSA filing called an “untraversable flooded section of a roadway” and proceeded into the standing water at reduced speed rather than rerouting. No one was hurt. Waymo filed the voluntary recall ten days later, on 30 April.…