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

Uber is one step closer to letting customers hail a self-driving vehicle in Austin, Texas, through its app. The company on Wednesday opened up its interest list so that curious riders can declare their interest in potentially being matched with a Waymo robotaxi,

The long-awaited partnership between Uber and Waymo has hit the road in Austin as the brands announced riders are now able to sign up for rides.