Autonomous autos are somewhat old hat for commuters in California and Nevada, but Japan's only just seen one hit its public roads. After earning a license plate in September, Nissan's driverless (and electric) Leaf hit the pavement of the country's Sagami Expressway, becoming the very first self-driving car to complete a public road test on a highway in the Land of the Rising Sun. The firm's Autonomous Drive tech, which handles everything from detecting road conditions to merging into traffic, piloted the car onto the interstate, passed slowpokes and exited the freeway. Sure, this is a notable milestone for Nissan, but the company's goal to sell autos with the technology by 2020 is still a long way off.