https://www.techradar.com/news/apple-and-vw-reportedly-team-up-for-self-driving-shuttles-for-employees

Apple CEO Tim Cook confirmed in 2017 that the company’s secretive driverless car project, codenamed Project Titan, would focus, at least at the time, on creating the autonomous AI that powers self-driving cars.

Apple's self-driving car project has grown since then, with the company expanding its fleet to 55 test cars, up from the three it started with last year.