Audi will show its urban concept at the 2011 Frankfurt auto show - a 1+1 ultra-light car perfect, it says, for tight city spaces. Audi’s urban concept is said to combine the elements of a race car with a fun city car to produce a concept carrying no excess weight and that concentrates on "sporty motion".The study has wheels that are free-standing, with protective plates bearing blinking strips of LEDs, while the cabin holds two people but has a roof that slides open to the rear for extra head room.LIGHT ELECTRIC SOMEWHAT SNUG: The urban concept has space for two people although we suspect things may become a little tight. However, things could become a bit awkward, as entry to the tight cabin is via the tail. It appears the urban concept is a showcase for Audi’s lightweight construction endeavours, though. The cabin, plus the seat undercarriages, are made of lightweight carbon fibre-reinforced polymer/Two e-tron electric motors provide propulsion.