London's Metropolitan Police is planning to introduce environmentally-friendly, hydrogen-fuelled police cars to its fleet in the coming years, a spokesman for the force told AFP on Sunday.
The police force, Britain's largest, will take four of the vehicles in a delivery of 70 to the Greater London Authority due by 2010.
"In the longer term the Metropolitan Police Service continues to explore green options including hydrogen fuel cell cars," a spokesman for the Met said.
Hydrogen-powered vehicles have no emissions aside from a trickle of water which is released as vapour through the exhaust system.
The fuel-cell cars, still under development by Japanese car manufacturer Honda, are powered by electricity generated by a hydrogen-oxygen chemical reaction.
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