The fast expansion of Waymo’s driverless car service is growing competition for Uber. The companies are also partners.

Uber is opening its "interest list" for riders in Austin, Texas, who want to try the Waymo robotaxi service there soon. Riders in Austin will be able to travel across 37 square miles of the city when Uber and Waymo fully launch the service.

Uber Technologies Inc. has set up a waitlist for customers interested in requesting a driverless Waymo vehicle in Austin, ahead of a planned launch later this year.Customers in Austin can join an “interest list” in the Uber app starting Wednesday to receive updates about the upcoming launch and increase their chances of being matched with an autonomous vehicle,