Elon Musk fought court cases on opposite coasts Monday, raising a question about the billionaire that could either speed his plan to put self-driving Teslas on U.S. roads or throw up a major roadblock: Can this wildly successful man who tends to exaggerate really be trusted?

In Miami, a Tesla driver who has admitted he was wrong to reach for a dropped cell phone moments before a deadly accident, spoke of the danger of putting too much faith in Musk's technology — in this case his Autopilot program.