Nissan Motor Co Ltd said its mid-sized sedan, Altima, would undergo an extensive redesign in an effort to boost demand for the best-selling vehicle in the automaker's stable. A visitor walks toward to the entrance of Nissan Motor Co's global headquarters in Yokohama, south of Tokyo May 10, 2013 REUTERS/Toru Hanai REUTERS: Nissan Motor Co Ltd said its mid-sized sedan, Altima, would undergo an extensive redesign in an effort to boost demand for the best-selling vehicle in the automaker's stable.