HANOVER, GERMANY - MARCH 09:  Bitkom President Dieter Kempf, Lower Saxony Governor Stephan Weil, British Prime Minister David Cameron, German Chancellor Angela Merkel and Volkswagen Group CEO Martin Winterkorn (L-R) stand next to a model of an Audi autonomic driven car during the opening evening of the 2014 CeBIT technology Trade fair on March 9, 2014 in Hanover, Germany. CeBIT is the world's largest technology fair and this year's partner nation is Great Britain.  (Photo by Nigel Treblin/Getty Images)