Audi technology chief Ulrich Hackenberg (right) unveils Audi A3 e-tron electric vehicle.
Mercedes exhibit draws crowd.
Mercedes S-Class Coupe concept version of production model expected in 2015.
Interior of Mercedes S-Class Coupe concept.
Mercedes Mercedes S500 plug-in hybrid.
Cockpit of S500 plug-in.
Mercedes AMG racer.
Plug-in Porsche Panamera.
Fiat's 500 Trekking model adds sporty touches.
Fiat pitches 500 models as lifestyle vehicles.
Hyundai's revamped i10.
Audi Sport Quattro Concept plug-in hybrid.
Audi' CEO Rupert Stadler introduces Nanuk Quattro concept, featuring V-10 diesel.
Audi Nanuk Quattro concept's scissor doors.
Aston Martin DB9 viewed from above.
BMW i8 model underbody structure.
BMW i8 gas-electric hybrid.
Inside BMW's i8.
Ford's gussied up Mondeo Vignale.
V10-powered Lamborghini Gallardo Squadra Corsa unveiled.
Porsche 918 Spyder.
Porsche 918 Spyder's unique, aggressively styled engine compartment cover.
Nissan's Friend-Me concept aimed particularly at young buyers in China.
Nissan CEO Carlos Ghosn pitches X-Trail model
Citroen Elysee WTCC to compete in World Touring Car Championship racing beginning next year.
BMW's indoor, elevated test track for i3 electric car.
More new model unveils and other action at this week's media opening of the Frankfurt auto show.
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