This document summarizes a dissertation on multi-modal transportation hubs. The dissertation aims to study the need for and circulation involved in multi-modal transportation. The objectives are to study transitional areas, requirements, and circulation. The scope is on uses and passenger movement patterns. Due to time constraints, some aspects could not be studied in depth. Case studies of London, Hong Kong and Singapore multi-modal hubs are provided. Conventional transportation planning is compared to multi-modal planning, which considers connections between modes. Passenger requirements like transfer times and accessibility are also discussed.