This chapter may seem a slight digression, but it is not. It examines the lessons that can be learned from experience in developing countries, and in particular in the burgeoning cities that are growing in population by at least 2-3 per cent a year, with some growing by 6 per cent per annum. Although, in resource terms these cities are consuming far less than those in developed countries, it is here that the growth in demand is increasing exponentially. As we have seen in the introductory part of this book, car ownership levels are increasing, with the same effects as has been seen in the past in Western cities. Road space is being allocated to the car in preference to the multitude of other potential uses to which it has been traditionally put. Streets in these cities were used by people, for walking, for trading, and for living in, but this is now changing. Cars and other motorized forms of transport are beginning to dominate, and people and cyclists ﬁ nd it harder and less safe to get around. This is not to say that it is bad but, in the context of sustainable urban development, these challenges need to be addressed.