The issue of urban transportation, together with its inter-related environmental and social concerns, continues to rise up the agenda of all city authorities and central governments. Reflecting the wide range of research being carried out in many countries today, and highlighting urban transport systems, traffic control, accessibility and mobility, control and simulation, finance, air quality and noise, and social issues and safety, this volume features papers presented at the Ninth International Conference on Urban Transport and the Environment in the 21st Century. The material included should be of interest to engineers, scientists and managers who are involved in the planning and management of urban transportation and transport policy.