On March 15, 2005, the first prototype of a motorcycle powered by a hydrogen fuel cell was presented in London by its manufacturer, Intelligent Energy. The maximum speed of this prototype is 80 km / h for a range of 160 km. Only problem, this vehicle would be too ... silent! The manufacturer plans to equip it with an artificial noise generator ...
source: http://www.moto-station.com/article1070.html
Econology note: a good example of the limits of this technology, yet the major manufacturers continue to inject millions of € into it…