The agency already opened an investigation in October over Waymo's performance around school buses. Waymo said it issued a software update to its fleet to improve performance.
Revised rules in California would allow self-driving trucks to test on public highways. The rules also close a loophole allowing police to issue tickets for driverless vehicles.
The service comes with a few caveats, including the addition of a human safety operator behind the wheel and a limited operating area. The companies said fully driverless operations, without a safety operator, will begin in the future and the service area will expand.
Tesla claimed in a weekend social media post that a Dutch regulator was set to approve its Full Self-Driving mode. It seems the regulator isn't quite in line with Tesla.