Zoox is stretching out its legs. The Amazon-owned robotaxi today announced that it's gearing up to expand its service in San Francisco and Las Vegas, while also eyeing two additional cities - Austin and Miami - for future service. Zoox, which is one of the few companies to use a purpose-built autonomous vehicle without traditional driving controls, said it has driven nearly two million driverless miles and ferried approximately 350,000 passengers since launching its customer service last year. Zoox doesn't charge for its robotaxi trips, as it's only approved to operate its custom-built vehicle on public roads under a "demonstration exempti … Read the full story at The Verge.