When turning on a highway exit ramp approximately 60mph Adaptive steering may have caused vehicle to not turn adequately and begin to go off the road. Lane keep assist failed to keep or even attempt to keep vehicle in lane and on the road. Adaptive steering may have prevented corrective action to prevent incident. Vehicle struck a guard rail as a result which potentially could have been fatal. No testing, investigation, or inspection has been conducted at this time. No warnings or messages were displayed.