Apple Inc. AAPL, +3.03% is working on a self-driving car and could be getting close to a test drive, documents obtained by The Guardian reportedly show. Apple engineers working on the secret project communicated with officials at a secretive testing site located on a former naval base in Concord, a city in the East Bay region of the San Francisco Bay Area, according to documents obtained from a Freedom of Information Act request. The site, called GoMentum Station, is being pitched specifically as a test site for self-driving cars and has hosted such tests by Honda and Mercedes Benz. Apple has several hundred employees working on development of an electric car, according to previous reports, a notion that has excited Wall Street. Silicon Valley has taken a big interest in autonomous driving of late, so Apple would be competing with neighbors such as Google Inc. GOOGL, -1.44% and Tesla Motors Inc. TSLA, +1.63% that have devoted more time to the technology.