DETROIT (NEWSnet/AP) — The U.S. government's highway safety agency has opened another investigation of automated driving systems; this time into crashes involving Waymo's vehicles.

The National Highway Traffic Safety Administration posted documents detailing the review on its website Tuesday, after receiving 22 reports of Waymo vehicles either crashing or doing something that may have violated traffic laws.

In the past month, the agency has opened at least four investigations into vehicles that can either drive themselves or take on at least some driving functions.

For Waymo, which was once Google's self-driving vehicle unit, the agency said it has reports of 17 crashes and five other reports of possible traffic law violations. No injuries were reported.

In the crashes, the Waymo vehicles hit stationary objects such as gates, chains or parked vehicles. Some of the incidents happened shortly after the Waymo driving system behaved unexpectedly near traffic control devices, according to the documents.

Waymo said NHTSA plays an important role in road safety, and it will continue working with the agency “as part of our mission to become the world’s most trusted driver.”

The company said it makes over 50,000 weekly trips with riders in challenging environments. “We are proud of our performance and safety record over tens of millions of autonomous miles driven, as well as our demonstrated commitment to safety transparency,” the statement said.

Waymo, based in Mountain View, California, has been operating robotaxis without human safety drivers in Arizona and California.

NHTSA said it would investigate the 22 incidents involving Waymo's fifth generation driving system plus similar scenarios “to more closely assess any commonalities in these incidents.”

In 2021 the agency ordered all companies with self-driving vehicles or partially automated systems to report all crashes to the government. The probes rely heavily on data reported by the automakers under that order. With that data, the NHTSA has begun a number of investigations with several systems and manufacturers.

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