Honda Motor Company has announced it aims to sell a car with automated highway driving functions around 2020.Reuters quotes a spokesman for Japan's third-largest automaker who declined to give details about the vehicle's planned capabilities ahead of next week's Tokyo Motor Show, where other Japanese automakers are expected to show "robot car" prototypes to the public.Toyota and Nissan have also set 2020, the year of the Tokyo Olympics, as the target date to bring self-driving cars to market.Reuters says that as writing lines of code becomes as vital to car making as developing efficient motors, traditional automakers are worried they could be outflanked by Google, which is currently testing a prototype driverless car, or Apple, which is exploring building a car and is studying self-driving technology.