The relationship between transport and development is neither obvious nor simple. Simply building a road does not guarantee that development will take place. Also, studies show that provision of a transport facility does not bring benefit to all social groups equally. The main beneficiaries of a new road, for example, are usually traders and middle-income groups, who have the capacity to take advantage of an expanded network to increase their livelihood. The rural poor (the largest social group in developing countries) usually derive very little benefit from traditional transport systems, and in many cases their livelihood suffers because of them.