Want to be one of the first people in America to ride in a self-driving car? Time to pack up and move to Phoenix.

Waymo—or, the company formerly known as Google’s self-driving car project—announced Tuesday that it plans to sign up hundreds of households living in and around the Phoenix, Arizona, area for a trial that will give them free, on-demand access to self-driving cars.

“Rather than offering people one or two rides, the goal of this program is to give participants access to our fleet every day, at any time, to go anywhere within an area that’s about twice the size of San Francisco,” John Krafcik, CEO of Waymo, wrote in a post on Medium.

The fact that Krafcik outlined how much of the greater Phoenix area will be open to riders is significant, suggesting that Waymo has mapped it in great detail and is confident that its cars will perform well there. This is similar to the approach Uber took when it launched its self-driving taxi program in Pittsburgh last year.

Uber’s Pittsburgh experiment showcased a technology that was a long way from self-sufficient (see “What to Know Before You Get In a Self-driving Car”), and since then the ride-hailing giant’s autonomous vehicle operations have had a rough ride—including being accused by Waymo of stealing its lidar technology.