According to the company's filing, the Amazon-owned self-driving car company suspended its driverless testing program for more than a week and voluntarily recalled its software after a crash in Las Vegas.

The April 8 crash involved an empty ZOOX vehicle and a passenger car, prompting the company to recall about 270 cars equipped with a specific version of the autonomous driving system. According to Zoox, the recall number does not reflect the full fleet size. The recall is out of concern that autonomous driving software may inaccurately predict the movement of another vehicle and increase the risk of a crash.

The company said no injuries were reported and that both vehicles caused minor damage. According to Zoox, the crash happened after a passenger car quickly approached the lane from a commercial lane traveling by a dedicated robot. The Zoox vehicle inaccurately predicts that the passenger car will continue and slows down and turns to the right. Instead, “the car stopped, succumbed to the Zoox Robotaxi completely and stayed in the shoulder lane,” the company said. "Zoox Robotaxi Braken braken braken braken braken braken braken braken braken braken braken braken of Braken braken of Braken braken of Braken braint of Braink," the company wrote in a blog post.

Zoox said it stopped all driverless testing operations on April 8 (the day of the crash) and conducted an internal review. Operations resumed after a software update was released to all ZOOX vehicles on April 17, according to a report submitted to the National Highway Traffic Safety Administration.

Crash accidents and voluntary recalls when Zoox pushed for the launch of commercial robotics services in Las Vegas. A company spokesperson confirmed that Zoox still plans to launch the service later this year.

The company has been testing its autonomous driving systems for modified Toyota Highlanders and custom robots that don't have steering wheels or pedals in various cities, especially along the Las Vegas Strip and certain San Francisco neighborhoods. Earlier this year, ZOOX allowed employees, media and other censored guests to try the service. The company also uses Highlander human safety operators to test in Austin, Miami and Seattle.

This is the second ZOOX recall this year. In March, the company made a voluntary recall of 258 cars due to problems with its own driving system that could lead to unexpected tough braking.

Last year, NHTSA conducted a preliminary investigation into the company after the agency received reports of two incidents, in which the motorcycle rider collided with the back of the Toyota Highlander equipped with ZOOX technology. Initial investigations found that in both cases, Zoox vehicles were carrying their autonomous systems on their own.