If you want to boost your chances of being paired with a Waymo vehicle, you can opt in by going to the Uber app, tapping Account > Settings > Autonomous vehicles (under Ride Preferences), and then hitting the toggle next to Get more Waymo rides.

Waymo’s robotaxis will begin carrying passengers through parts of Atlanta Tuesday in an expansion of a partnership with Uber’s ride-hailing service that began earlier this year in Austin.

The launch, if successful, is poised to propel the businesses of both companies. Uber, which has locked in partnerships with 18 autonomous vehicles companies, said it has an annual run rate of 1.5 million mobility and delivery AV trips on its network.