Amazon’s self-driving unit Zoox has agreed to recall 270 autonomous vehicles after one of its unoccupied robotaxis was involved in a crash with a passenger car in Las Vegas on April 8. While no injuries occurred, Zoox identified a flaw in its automated driving system, which may misjudge scenarios where another vehicle slowly approaches perpendicularly and stops—potentially leading to collisions.

In the incident, the Zoox vehicle anticipated the other car would proceed forward, adjusted its path, but the car stopped fully, causing the robotaxi to brake hard and collide with it. Following the crash, Zoox temporarily paused operations, conducted a safety review, and developed a software update to fix the issue.

The problem affects Zoox vehicles traveling over 40 mph when another car encroaches gradually from a perpendicular driveway. This recall comes shortly after the National Highway Traffic Safety Administration (NHTSA) closed a separate investigation into 258 Zoox vehicles related to unexpected braking that led to injuries.

However, another NHTSA probe into Zoox’s 2022 self-certification of a robotaxi without traditional driving controls remains ongoing.