At the touch of a button, or automatically on reaching a speed of 80 km/h, the Mercedes-Benz “Concept IAA” performs a fascinating transformation in which the captivatingly beautiful four-door coupé turns into an aerodynamics world champion: eight segments extend at the rear, increasing its length by up to 390 millimetres; front flaps in the front bumper extend by 25 millimetres to the front and 20 millimetres to the rear, improving the air flow around the front end and the front wheel arches; the Active Rims alter their cupping from 55 millimetres to zero; and the louvre in the front bumper moves 60 millimetres to the rear, improving the underbody air flow.