as it is a type of transport with an affordable cost and helps to reduce pollution by not using fossil fuels and no generating any noise. Other nonspecific advantages are that the overall duration of trips is often predictable, that it can be used in a very wide range of ages and, as walking, it not only improves the health of its users, but also for the rest of the inhabitants of the city, by reducing the number of trips in other more contaminants modes.