General Motors announced today that the new Cadillac CT6 will include a "Super Cruise" feature -- described by the company as "the industry's first true hands-free driving technology for the highway". The technology is similar to Tesla's Autopilot feature that lets people take their hands off the wheel when they're driving in highway settings. But this type of driver-assistance capability is still new, and it falls in a legal grey area if it's involved in a crash.