Two new self-driving car services—one in Atlanta from Lyft and May Mobility, another in Las Vegas from Amazon subsidiary Zoox—prove that the robotaxi race is still on. Now comes the hard part.

Two new self-driving car services—one in Atlanta from Lyft and May Mobility, another in Las Vegas from Amazon subsidiary Zoox—prove that the robotaxi race is still on. Now comes…

But it's not quite a commercial service just yet. These rides are free — for now.