The central areas of big cities have turned into a green zone, where only the means of transportation allowed are bicycles. At the same time, by rotating the pedals, the cyclist generates electric power - and then, if he or she is in a hurry, a bicycle can be switched to a scooter mode. If it is necessary to cover a long distance, a bicycle can be folded and placed under a bus or taxi seat. Furthermore, the electricity accumulated can be used a transportation fare.
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