PSFK has kept an eye on the revival of the small car market and brought you coverage of vehicles from Mini, Ford, VW, BMW and Fiat to name a few. For the upcoming 2011 Frankfurt Auto Show, Audi is planning to unveil a new concept car which is even smaller. Called the Audi Urban Concept, the vehicle is something like a cross between a covered motorcycle and a large go-kart. Audi has developed the concept as an ultra-light car for congested urban spaces. It seats two people in a staggered front to back layout.