Waymo is under investigation for reported accidents and traffic violations

The U.S. government’s Highway Traffic Safety Administration has opened another investigation into automated driving systems, this time into accidents involving Waymo self-driving vehicles.

The National Highway Traffic Safety Administration opened the investigation 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 either drive themselves or can perform at least some driving functions, as it appears to become increasingly aggressive in regulating the devices.

As part of its investigation into Waymo, Google’s former self-driving vehicle division, the agency said it had received reports of 17 accidents and five other reports of possible traffic law violations.