The top U.S. auto safety regulator has opened an investigation into Zoox, the autonomous vehicle subsidiary of Amazon.com Inc., after two incidents in which its SUVs suddenly braked and were rear-ended.
The National Highway Traffic Safety Administration’s Office of Defect Investigation opened a preliminary evaluation after receiving notice of two Toyota Highlander sport utility vehicles equipped with Zoox’s automated driving system braked unexpectedly. In both cases, motorcyclists collided with the Zoox vehicles, resulting in minor injuries, NHTSA said.
The agency has confirmed that each of the Zoox vehicles were operating in autonomous mode leading up to the collisions. Both incidents occurred during the daytime and within the domain the Zoox system is designed to operate in, according to NHTSA.
The probe covers an estimated 500 vehicles, according to documents posted May 13 on the agency’s website. Zoox and Toyota — which isn’t subject to the investigation — didn’t immediately respond to requests for comment.