SELF-DRIVING CARS AREN’T just here. They are, it seems safe to say, just about everywhere—roaming the streets of San Francisco, New York City, Phoenix, Boston, Singapore, Paris, London, Munich, and Beijing. And as Waymo (Google’s self-driving car project) launches the world’s first fleet of truly driverless cars in Arizona, nearly every automaker, all serious tech companies, and a flock of startups are rushing to colonize an industry that has the potential to save tens of thousands of lives—and generate trillions of dollars.