Enlarge (credit: David Paul Morris/Bloomberg via Getty Images) Apple has talked to at least four different companies about purchasing lidar sensors, Reuters reports. Apple is also reportedly working on a home-built lidar sensor. The news suggests that Apple is still taking its self-driving car effort, known internally as Project Titan, seriously. Apple hasn't publicly revealed what kind of self-driving technology it is working on, and indeed reporting suggests that the company's plans have shifted over time.