The National Highway Traffic Safety Administration said Thursday it was closing an investigation into 1,194 robotaxis operated by General Motors’ Cruise unit after a recall resolved issues related to the autonomous vehicles braking harshly and stalling.
The regulator also said none of the immobilization incidents reviewed resulted in a crash or injury.
Cruise filed a recall of its software earlier this month, affecting all of its vehicles equipped with automated driving systems in the United States.
The unit is still facing investigations from the U.S. Department of Justice and the Securities and Exchange Commission after an accident last October in which one of its robotaxis struck a pedestrian and dragged her 20 feet (six meters).
NHTSA said its Office of Defects Investigation determined that Cruise vehicles were involved in 10 crashes, four of which resulted in injuries to vulnerable road users, after analyzing hard braking data from 7,632 incidents involving Cruise’s automated driving system.
Cruise, along with other autonomous vehicle technology companies such as Alphabet Inc.’s Waymo and Amazon Inc.’s Zoox, have come under heavy regulatory scrutiny over safety concerns following several accidents involving their vehicles.
In response to the October crash and subsequent investigations, Cruise’s CEO resigned last year and General Motors subsequently announced plans to reduce spending at the self-driving unit.
The California Public Utilities Commission, which regulates robotaxi operations in the state, imposed the maximum fine of $112,500 on Cruise for failing to promptly provide the commission with complete information about the October crash.