TEMPE, Arizona — I secure my seatbelt in the back seat, press the START RIDE button, and my Waymo One Chrysler Pacifica enters traffic on Warner Road, the steering wheel spinning right — then left — into the center lane before slowing for a stoplight. There is no one in the car but me. Four years after an autonomous Uber car killed a cyclist here, fully autonomous Waymo ride-sharing is on the streets ferrying drivers to their destinations. Like Uber or Lyft, they are open to the public. Unlike those familiar services, there are no drivers on board. I took multiple trips over three days across …