Several thousand people gather at London's Liverpool Street station, waiting for directions to the secret location.
People crowd the escalators.
Below it, instead of the usual traffic jam and choking fumes, a full-scale street party was underway. Loud rave music boomed out from two parked lorries. Children played in sand on the road. People danced, drank, painted designs on the road, even stripped naked - all in the name of opposing 'car culture'. Work and living patterns which depend on the car have resulted in dangerous smogs blanketing cities, a likely hastening of global warming and a spiralling of demand for oil.