Google's fleet of self-driving cars have hit the roads without a human driver for the first time.
Waymo, the driverless car arm of parent company Alphabet, revealed the "next phase" of the project, which is one of the most developed in autonomous vehicle in the world.
Previously road tests have taken place with a person in the driving seat ready to take the wheel.
"Starting now, Waymo’s fully self-driving vehicles — the most advanced self-driving vehicles on the road today — are test-driving on public roads, without anyone in the driver’s seat," the company said.
"And soon, members of the public will get to use these vehicles in their daily lives," it added. "After more than eight years of testing and development, we're ready to unlock the potential of fully self-driving technology, so we can make it easier and safer for everyone to get around."
Initially the cars will run in an area of Phoenix, Arizona, but it has ambitions to "cover a region that’s larger than the size of Greater London, and we’ll add more vehicles as we grow".
The fleet will work as an Uber-like service available to a small group of early testers at first.
Watch the driverless cars in action below.