Driverless transportation company Waymo has issued a software recall of its vehicle fleet following an incident last month during flooding in San Antonio. The Waymo vehicle was swept up in flood waters and washed into Salado Creek during heavy rains on April 20. The car was unoccupied and no one was injured in the incident. The recall notice said while the vehicle detected the flooded road, it continued on its path and proceeded at a reduced speed. The company issued the recall of nearly 3,800 fifth- and sixth-generation vehicles to the National Highway Traffic Safety Administration. Waymo said a remedy is currently under development. However, it has already modified the scope of vehicle operations to increase weather-related constraints. In an earlier incident that occurred earlier in April, another Waymo vehicle became stranded in floodwaters near McCullough Avenue and Contour Drive. Both cars were unoccupied, and no one was injured in either incident. The recall affects the entire fleet of Waymo autonomous vehicles, including ones in Houston. Though the company paused its services in San Antonio, a spokesperson said the recall will not disrupt service in Houston. RELATED: Waymo is officially giving rides to Houstonians in fully self-driving cars Waymo previously said it would reevaluate how its vehicles respond to flood-prone areas and severe weather alerts before restarting service. The back-to-back flood incidents also underscored how quickly changing weather conditions in San Antonio can challenge autonomous vehicle technology. At the same time, Waymo is expanding its services in Houston to encompass nearly 50 square miles, a spokesperson said on Wednesday. Waymo robotaxis will now be able to drive to East Downtown, the Medical Center, and NRG Park. Waymo is also expanding in several other cities, including Austin, Atlanta, and San Francisco, beginning Wednesday. Part of this, the company says, is working