In doing so, it also compares the availability of such infrastructure among the different groupings of CSN, and how they compare to other developing countries and the developed countries in the region. This may serve to later identify individual infrastructure priorities of the heterogeneous group of CSN. They also enhance resource allocation efficiency. Sustainable transport systems therefore play a critical role in economic and social development by: (a) providing access to economic and social opportunities, (b) facilitating the movement of people, goods, labour, resources, products and ideas, (c) creating market opportunities for both consumers and producers, (d) enabling manufacturers to take advantage of locational strengths, and (e) allowing the expansion of supply chains across borders. The mobility of goods and people plays an important role in sodal and economic development, promoting gains from trade as well as the exchange of knowledge. Hence, key transport sectors, i.e., roads, railways, seaports, airports, dry ports and other transport infrastructure, make a key contribution to growth (World Bank, 2006).