After twelve years of reserch and development, French inventor Guy Negre has developed the air car [wiki] which has an so-called air engine [wiki] that can only be powered by compressed air. The car installed such engines is both eviroment-friendly and economical.As High T3ch already pointed out, the speed of car is not very fast for now but it's very promising. For example, the urban vechile (manufactured by Guy's Moteur Developpement International company) shown above is called Minicats with the maximum speed is only 50 km/h.
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