designer's own words:OXYGEN-Taxi is the next generation public a transport system that keeps the individuality and melting with the city structure to sustainability and environmental friendly system. The most cars dirty the environment. The taxi vehicle OXYGEN cleans the environment. The sheet-like roof structure filters particulate matter from the air. The H2O won from the fuel cells is supplied to the air. In particularly warm towns the climate is improved so considerably. The taxi driver steers the taxi about a joystick. Cockpit can be locked, the remaining seats can be further used than town piece of furniture if the taxi is not used. This small, light and cost gentle vehicle is disburdening the city of high volume of traffic. At night there shines the roof. Several Taxi's form an oasis, fully integrated in cities life.