Visitors take pictures of a Mercedes SLS AMG Electric Drive car at the stand of German car manufacturer Mercedes Benz at the Frankfurt Motor Show (IAA) September 14, 2013. The world's biggest auto ... more 
Visitors take pictures of a Mercedes SLS AMG Electric Drive car at the stand of German car manufacturer Mercedes Benz at the Frankfurt Motor Show (IAA) September 14, 2013. The world's biggest auto show is open to the public until September 22. REUTERS/Ralph Orlowski (GERMANY - Tags: BUSINESS TRANSPORT) less 
1 / 31
Reuters | Photo By RALPH ORLOWSKI / REUTERS
Sat, Sep 14, 2013 6:51 AM EDT