This proceedings contains papers covering three key issues in transportation: policy and management; planning and optimization; and applications of new technologies. Technical areas in the papers include transportation planning, traffic operations and optimization, railway transportation management, highway management systems, and transportation policies. These papers were presented at the Second International Conference on Transportation and Traffic Studies, ICTTS 2000, held at the Northern Jiaotong University in Beijing, China, July 31-August 2, 2000. The goal of the conference was to provide a forum for transportation professionals from around the world to explore the key issues, innovative technologies, current projects, and future prospects for traffic and transportation studies.