The ISTTT series is the main gathering for the worlds transportation and traffic theorists, and the resulting volume is a field-defining milestone featuring the most promising thinking and theoretical developments. It reflects the major renewal the field is experiencing, with the entry of many new scientists from a variety of disciplines, and the mutual coexistence of a growing number of theoretical perspectives and modelling cultures. While this volume covers a wide range of aspects of the modelling of transportation processes as complex systems, an overarching theme is the recognition that these systems are a collective expression of individual human decisions. A significant number of the contributions published here therefore deal with some aspect of human behaviour whether as travellers, drivers, passengers, operators, or regulators reflecting the great strides being made in developing theories and mathematical representations of these phenomena. Essential reading for anyone interested in researching or understanding traffic and transportation phenomena and in developing effective approaches to planning, design and management of transportation systems.