Video: Bizarre Audi concept vehicle caught in Berlin

Future mobility solution might be one of those buzz phrases bandied about the car industry with the abandon of a strip club MC calling out dancers' stage names, but at least the term is producing some fascinating concepts.

Audi appears to be the latest manufacturer to climb onto the 'sustainable personal transportation' bandwagon. This dramatic four-wheeled tandem was caught on the streets of Berlin in heavy disguise.