Waymo's driverless car: ghost-riding in the back seat of a robot taxi

I'm in the middle seat of a Chrysler Pacifica minivan, heading north on Dobson Road in Chandler, Arizona, when I notice we may have taken a wrong turn. Under normal circumstances, I would just lean forward and ask the driver for an explanation. There is, after all, no driver to ask. Last October, Alphabet's self-driving subsidiary Waymo emailed its customers in the suburbs of Phoenix to let them know that "completely driverless Waymo cars are on the way." For several years, Waymo has offered its autonomous taxi service to a small group of people, but the rides typically included a safety driver behind the steering wheel. Now, Waymo is saying more of those rides will take place sans safety driver, a sign that the company is growing confident in the accuracy of its technology.