It may be hard to imagine: trucks guided by GPS, radar, sensors, and software, hauling much of the nation's cargo. Yet autonomous vehicle technology has made headlines for years, and experimental autonomous cars are already on the roads today. Google's driverless cars have logged more than 300,000 miles on California and Nevada highways since 2011. That same year, Chinese carmaker FAW unveiled its own autonomous car, which it demonstrated on public roads. Toyota and Audi exhibited their versions of the technology at the Consumer Electronics Show in January 2013.
