FRANKFURT AM MAIN, GERMANY - SEPTEMBER 22:  A Golf GTD car at Volkswagen cars at the 2015 IAA Frankfurt Auto Show on September 21, 2015 in Frankfurt, Germany. Volkswagen CEO Martin Winterkorn apologized yesterday to consumers following allegations by the U.S. Environmental Protection Agency that the company had installed software into its diesel cars sold in the USA that manipulated emissions results. Volkswagen share prices plummeted by over 20% on the Frankfurt stock exchange and the company faces a recall of at least 470,000 cars and up to USD 18 billion in fines.  (Photo by Hannelore Foerster/Getty Images)