This lecture explores the concept of sustainable cities, focusing on urban mobility in African cities. It covers the definition of sustainable cities, the conditions for city sustainability, and the approach to mobility for sustainable cities. The instructor emphasizes the importance of inclusive, resilient, and environmentally friendly urban planning, highlighting the need for good governance and financial resources. The lecture also discusses the role of mobility in sustainable urban development, advocating for a hierarchical and organized approach to transportation planning. In conclusion, the importance of a multimodal transport system and accessible public transportation is highlighted.