This lecture explores the social dimensions of transport within large urban systems, emphasizing the importance of understanding the social impacts of transportation. It delves into the definition of social impacts, winners and losers of transport, transport-related social exclusion, and policy implications. The instructor discusses how transport influences societies, the distributional effects of transport investments, and the various categories of social exclusion related to transportation. Moreover, the lecture highlights key issues in social impact appraisal and the methods for measuring and appraising these impacts.