Martin Winterkorn, chief executive officer of Volkswagen AG, looks on during previews to IAA Frankfurt Motor Show in Frankfurt, Germany, on Tuesday, Sept. 15, 2015. The Frankfurt International Motor Show starts on Thursday, and nearly one million visitors are expected to view the latest must-have vehicles and motoring technology from over 1,000 exhibitors in a space equivalent to 33 soccer fields. Photographer: Krisztian Bocsi/Bloomberg via Getty Images
