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 be trusted.

A federal court in Miami began considering Monday whether Elon Musk's car company should share blame for the death of a stargazing university student after a runaway Tesla sent her flying 75 feet through the air and severely injured her boyfriend.