Toyota Motor Corp and Nissan Motor Co have also set 2020, the year of the Tokyo Olympics, as the target date to bring self-driving cars to market.

A spokesman for Japan's No. 3 automaker 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.

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.

(Reporting by Maki Shiraki and Naomi Tajitsu; Editing by Edwina Gibbs)