Proceedings of the Eleventh International Conference of Chinese Transportation Professionals, held in Nanjing, China, August 14 17, 2011. Organized by Chinese Overseas Transportation Association (COTA); Southeast University. Sponsored by the Transportation & Development Institute of ASCE; National Natural Science Foundation of China (NSFC). This collection contains 434 peer-reviewed papers discussing critical transportation issues, sharing experience in transportation research and development, and exchanging ideas for future transportation studies. Topics include: transportation policy and economics; transportation planning and modeling; traffic operations, management, and control; intelligent transportation systems (ITS); traffic safety and emergency response; transportation and sustainability; transit and rail systems; transportation infrastructure design and construction; pavement and materials engineering, and highway maintenance; logistics and freight transportation; vehicle technologies and water transportation and aviation.