Google subsidiary Waymo for autonomous taxis and deliveries on Wednesday said that it would update the software of its entire fleet after one of its unoccupied driverless vehicles crashed into a telephone post in May.
A Waymo spokeswoman said that the software update had been reported to the US National Highway Traffic Safety Administration (NHTSA) as a voluntary recall.
This is the second official recall by the Google subsidiary. The first one, in February, was due to the software's inability to predict the path of a car being towed by a truck. Waymo had warned that the issue had the potential to lead to rear-end collisions.
Waymo's self-driving taxis are operating in Phoenix, Arizona, as well as in San Francisco and Los Angeles, and are currently authorized to operate without a human driver.
Waymo's robotaxis complete over 50,000 journeys per week.