The production version of the third generation of A-Class vehicles was based on the 2011 Concept A-Class, and was unveiled at the 2012 Geneva Motor Show, Mercedes-Benz A-Class hatches new level of refinement for its class It has an entirely different design, and larger than the previous two generations of the A-Class, with a total length of 4292 mm , making it a fully-fledged small family car for the first time.