Traffic and transportation studies : proceedings of ICTTS'98, July 27-29, 1998, Beijing, People's Republic of China : sponsored by Northern Jiaotong University, co-sponsored by American Society of Civil Engineers ... [et al.] / edited by Zhaoxia Yang, Kelvin C.P. Wang, Baohua Mao. - Yang, Zhaoxia; Wang, Kelvin C. P; Mao, Baohua (American Society of Civil Engineers, 1998)