General Motors CEO Mary Barra speaks next to the Chevrolet Bolt EV electric concept car and the 2016 Chevrolet Volt hybrid after they were unveiled during the first press preview day of the North American International Auto Show in Detroit

REFILE – CORRECTING DATE – General Motors CEO Mary Barra speaks next to the Chevrolet Bolt EV electric concept car (L) and the 2016 Chevrolet Volt hybrid (rear) after they were unveiled during the first press preview day of the North American International Auto Show in Detroit, Michigan January 12, 2015. REUTERS/Rebecca Cook (UNITED STATES – Tags: TRANSPORT BUSINESS)