Frankfurt Auto Show

Bugatti Vision idea auto is exhibited amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

The new Porsche 911 Carrera S (L) and idea auto Mission E are introduced amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

SEAT Leon Cross Sport is exhibited amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

New Porsche 911 Carrera S auto is displayed amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Guests stand around autos amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Bugatti Vision idea auto is introduced amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Volkswagen Tiguan R-Line auto is introduced amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

A guest takes a logo's photo on the Lamborghini Huracan LP 610-4 Spyder amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

The new electric Porsche Mission E idea auto is displayed amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Lamborghini Huracan LP 610-4 Spyder is exhibited amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

SEAT Leon Cross Sport is exhibited amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Porsche CEO Matthias Mueller leaves the new electric Porsche Mission E idea auto in front of an audience amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Guests stroll around Bentley Bentayga amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Audi CEO Rupert Stadler presents the new Audi A4 g-tron (L) and A4 ultra models amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Lamborghini CEO Stephan Winkelmann remains alongside the Lamborghini Huracan LP 610-4 Spyder amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Bugatti Vision idea auto is introduced amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Bentley Bentayga auto is exhibited amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Individual from the Board of Management for the Volkswagen brand Heinz-Jakob Neusser presents the VW Tiguan GTE amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

The new Audi e-tron Quattro has its reality debut amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Ulrich Hackenberg, Board Member for Technical Development of Audi, gives a world debut to the new Audi e-tron Quattro amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Volkswagen Tiguan auto is exhibited amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

Bugatti Vision idea auto is introduced amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach

New Porsche 911 Carrera S autos are exhibited amid the Volkswagen bunch night in front of the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 14, 2015. REUTERS/Kai Pfaffenbach