This month, Singapore unveiled the world's first self-driving taxis. Select passengers hailed free rides last Thursday through their smartphones. While multiple companies, including Google and Volvo, have been testing self-driving cars on public roads for several years, nuTonomy, an automonomous vehicle software startup, says it is the first company to offer rides to the public. The taxis are currently only running in a 2.5-square-mile business and residential district, and pick-ups and drop-offs are limited to specified locations. What do you think?