85th International Motor Show in Geneva

The QUANT e-Sportlimousine by nanoFlowcell AG is pictured at the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

An employee cleans a Ferrari car ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Employees prepare an Alfa Romeo 4C Spider car ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Matthias Mueller, CEO of Porsche, speaks next to a Porsche Cayman GT4 during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

A Porsche Cayman GT4car is pictured during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

A man walks past a so-called Lightmobile based on a Karl model by Opel ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

A Toyota Auris Hybrid Touring Sports car is pictured ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Employees prepare a new Toyota Auris Hybrid car ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

People take pictures of Toyota Mirai car ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

The new VW Caddy is pictured during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Employees prepare a Maserati GranTurismo MC Stradale car ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

A man takes a picture of Rolls-Royce Serenity car ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

An employee cleans the FIAT booth ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Audi CEO Rupert Stadler speaks next to the new Audi R8 V10 plus car during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Audi CEO Rupert Stadler speaks next to the new Audi R8 V10 plus car during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Bentley CEO Wolfgang Durheimer speaks next to the new Continental GT Speed during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Bentley CEO Wolfgang Durheimer speaks next to the new Continental GT Speed during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

A new VW Touran car is seen during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Heinz-Jakob Neusser, VW Head of Technical Development, speaks next to a new Touran car during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Bentley experimental car EXP 10 Speed 6 is pictured during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Bentley CEO Wolfgang Durheimer speaks next to the experimental car EXP 10 Speed 6 during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Bentley CEO Wolfgang Durheimer speaks next to the experimental car EXP 10 Speed 6 during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Bugatti CEO Wolfgang Durheimer speaks next to the Bugatti Veyron Grand Sport Vitesse 'La Finale', the last of the 450 cars made, during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

Bugatti CEO Wolfgang Durheimer speaks next to the Bugatti Veyron Grand Sport Vitesse 'La Finale', the last of the 450 cars made, during a Volkswagen Group event ahead of the 85th International Motor Show in Geneva, March 2, 2015. REUTERS/Arnd Wiegmann

The President and CEO of Lamborghini Stephan Winkelmann introduces the new Lamborghini Aventador SV during a preview show of Volkswagen Group, as part of the 85th Geneva International Motor Show, Switzerland, Monday, March 2, 2015. (AP Photo/Laurent Cipriani)

People gather around the new Lamborghini Aventador SV during a preview show of Volkswagen Group, as part of the 85th Geneva International Motor Show, Switzerland, Monday, March 2, 2015. (AP Photo/Laurent Cipriani)