Alphabet Inc.’s Waymo is launching a new account type that lets teenagers hail a robotaxi and ride alone, expanding its rider base while continuing to test its service in more US cities.

Waymo is opening up its robotaxi service to younger riders with the launch of teen accounts in Phoenix. Teenagers aged 14–17 can now sign up for an account on Waymo One, the company’s ridehail service. The account will be linked to their parent or guardian, but approved teens will be allowed to ride independently without an adult.

Waymo said it will offer “specially-trained Rider Support agents” during rides hailed by teens and loop in parents if needed.