[1]State Key Laboratory of Ocean Engineering Shanghai liao Tong University Shanghai 200240 China;
[2]Key Laboratory of Hightuay Engineering of Ministry of Education Changsha Uniuersity of Science & Technology Changsha 410004 China;
[3]Transportation Research Center Shanghai Jiao Tong University Shanghai 200240 China;
[4]Department of Urban and Regional Planning Uniuersity of Flarida Gainesuille 32611 USA;