BBC NEWS | Europe | Revolutionary bike 'too quiet': "The world's first purpose-built hydrogen-powered bike could be fitted with an artificial 'vroom' because of worries its silence might be dangerous.
A prototype of the motorbike, which could cost more than $8,300 (�4,500), was unveiled in London on Tuesday.
The problem with the 'fuel cell' bike, which produces no polluting emissions, is that it is too quiet."
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