[Xianming Shi] School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, China
Western Transportation Institute, PO Box 174250, College of Engineering, Montana State University, Bozeman, MT 59717-4250, USA
Civil Engineering Department, 205 Cobleigh Hall, Montana State University, Bozeman, MT 59717-2220, USA. E-mail:
[Lisa Ballard] Current Transportation Solutions, Inc., 10 Sweetgrass Ave, Bozeman, MT 59718, USA. E-mail:
[Shaowei Wang; Enzhen Huang] Western Transportation Institute, PO Box 174250, College of Engineering, Montana State University, Bozeman, MT 59717-4250, USA. E-mail:
