Robo taxis are hitting the streets of Los Angeles in a test of Google's Waymo autonomous vehicle.

Dmitri Dolgov, Waymo CEO, took to Twitter on Monday to announce that the Waymo One service was ready for the new phase after a "rigorous cycle of validation and safety readiness evaluation."

Last month, its autonomous cars traveled more than one million miles during their test runs in Arizona and California, according to the company. Over that span, two incidents were reported serious enough to be tracked by the National Highway Traffic Safety Administration.

While 18 other minor incidents were reported, they were not considered serious enough to be tracked by the NHTSA. According to the company's data, despite most human-operated vehicle crashes occurring at intersections or involving bikers and pedestrians, none of the autonomous vehicle incidents did.

"Comparing the Waymo Driver’s performance to human driving over time is an important method of safety assessment that can provide further validation of the results," the company stated in a blog post.