Sustainable smart cities are innovative urban areas that utilize information technology, communication, and other means to enhance the quality of life, optimize urban activities, services, and increase competitiveness. In the context of the Fourth Industrial Revolution, the development of smart cities, along with adopting the Transit-Oriented Development (TOD) model with a focus on extensive public transportation, is a suitable and effective direction for Hanoi's urban development. Smart cities are built on three pillars: intelligent social infrastructure, intelligent urban technical infrastructure, and digital infrastructure. The development of cities following the TOD model is closely related to smart cities and these three pillars. Research and evaluations have shown that TOD development is an intelligent solution for urban areas, effectively addressing various economic, social, and environmental challenges while preserving resources.