Edmunds takes closer look at Tesla, Cadillac and Nissan semi-autonomous driving systems

The National Transportation Safety Board is investigating a crash and fire involving a Telsa Model S car. Two teens died in Fort Lauderdale, Florida crash on Tuesday. The probe is not expected to involve Tesla's semi-autonomous Autopilot system. You've heard of Tesla Autopilot, but perhaps not always in a good way: The semi-autonomous driving system is now under investigation by the National Transportation Safety Board for the role it may have played in a March fatal accident near Mountain View, Calif. But you might not have heard about Cadillac Super Cruise and Nissan ProPilot Assist, two other semi-autonomous driving systems that are available in new cars today.