Challenges and advances in sustainable transportation systems plan, design, build, manage, and maintain : proceedings of the 10th Asia Pacific Transportation Development Conference, Beijing, China, May 25-27, 2014 / edited by Yong Bai, Ph.D., P.E., DU Xiuli, Ph.D., Pei-Sung Lin, Ph.D., P.E., Wei-Chou Virgil Ping, Ph.D., P.E., Endi Zhai, Ph.D., P.E., Yilei Huang, Ph.D. ; sponsored by International Chinese Transportation Professionals Association, Beijing University of Technology, Transportation & Development Institute (T&DI) of the American Society of Civil Engineers.