Finally, redundancy is about spare facilities that compensate for the failing of other infrastructure. The bicycling era has not lasted too long, as especially in North America the automobile revolution starting at the beginning of the 20m century made the car a favoured form of transportation whether urban or sub-urban, while the bicycle become predominantly a children toy or means for pass-time. The situation looks different in developing countries, in particular, in Africa and Asia, where walking and cycling continuous to be the dominant form of mobility .This however is largely not by choice, but rather driven by lackof affordable and accessible alternatives, with many pedestrians and cyclist belonging to lower income groups2'. People pay a low tee to use the bicycles from one of the many bicycle parking stations located in the city and they can return them to any station they wish. " Freedom bikes" in Paris fill the streets, proving more popular than anticipated.