It was basically inevitable. At some point, the safety of electric-car maker Tesla Motors' (NASDAQ: TSLA) Autopilot, or its traffic-aware cruise control, automatic steering, and accident avoidance systems, would face scrutiny after an accident. On the heels of a tragic fatal accident in a Model S that occurred while Autopilot was engaged, the National Highway Traffic Safety Administration opened a preliminary evaluation into Autopilot's performance.Model S with Autopilot engaged.