th It is our great privilege and honor to present the proceedings of the 18 International Symposium on Transportation and Traffic Theory (ISTTT), held at The Hong Kong Polytechnic University in Hong Kong, China on 16-18 July 2009. th The 18 ISTTT is jointly organized by the Hong Kong Society for Transportation Studies and Department of Civil and Structural Engineering of The Hong Kong Polytechnic University. The ISTTT series is the main gathering for the world's transportation and traffic theorists, and those who are interested in contributing to or gaining a deep understanding of traffic and transportation phenomena in order to better plan, design and manage the transportation system. Although it embraces a wide range of topics, from traffic flow theories and demand modeling to road safety and logistics and supply chain modeling, the ISTTT is hallmarked by its intellectual innovation, research and development excellence in the treatment of real-world transportation and traffic problems. The ISTTT prides itself in the extremely high quality of its proceedings. Previous ISTTT conferences were held in Warren, Michigan (1959), London (1963), New York (1965), Karlsruhe (1968), Berkeley, California (1971), Sydney (1974), Kyoto (1977), Toronto (1981), Delft (1984), Cambridge, Massachusetts (1987), Yokohama (1990), Berkeley, California (1993), Lyon (1996), Jerusalem (1999), Adelaide (2002), College Park, Maryland (2005), and London (2007). th th This 18 ISTTT celebrates the 50 Anniversary of this premier conference series.

Transportation and Traffic Theory 2009
Golden Jubilee

Papers selected for presentation at ISTTT18, a peer reviewed series since 1959

edited by William H.K. Lam, The Hong Kong Polytechnic University,
S.C. Wong, The University of Hong Kong and
Hong K. Lo, The Hong Kong University of Science and Technology

The series of International Symposia on Transportation and Traffic Theory (ISTTT) is the main gathering for the world's transportation and traffic theorists, and those who are interested in contributing to or gaining a deeper understanding of traffic and transportation phenomena in order to better plan, design and manage the transportation system. Although it embraces a wide range of topics, from traffic flow theories and demand modeling to road safety and logistics and supply chain modeling, the ISTTT is hallmarked by its intellectual innovation, research and development excellence in the treatment of real-world transportation and traffic problems. The ISTTT prides itself in the extremely high quality of its proceedings. Previous ISTTT conferences were held in Warren, Michigan (1959), London (1963), New York (1965), Karlsruhe (1968), Berkeley, California (1971), Sydney (1974), Kyoto (1977), Toronto (1981), Delft (1984), Cambridge, Massachusetts (1987), Yokohama (1990), Berkeley, California (1993), Lyon (1996), Jerusalem (1999), Adelaide (2002), College Park, Maryland (2005), and London (2007). It is timely to organize the 18 ^th ISTTT in Hong Kong, as the thrust of transportation infrastructure development has emerged strongly in Asia. The 18 ^th ISTTT celebrates the 50 ^th Anniversary of this premier conference series.

This volume contains 35 chapters selected for presentation at the 18 ^th ISTTT from 230 extended abstracts and subsequently 108 invited full paper submissions, following a rigorous two-tier peer review process. Theyaddress a wide range of topics covering both scientific and operational aspects of transportation and traffic, spanning all modes of transport, including freight as well as private and public transport.