<p>The promise of self-driving cars is the promise of Silicon Valley to make the world a better place. Tesla CEO Elon Musk, who lives in Los Angeles, has made a reasonable argument about this vehicle technology, which he hopes to have available to his customers within 10 years: Humans make terrible drivers, and "1.2 million people that die every year in manual crashes." So-called robot vehicles have a much better record, though there are only a few on the road, in beta mode. Critics of the technology are "killing people," he told reporters last year.</p>