1. Chongqing Key Laboratory of Intelligent Integrated and Multidimensional Transportation System, Chongqing Jiaotong University, Chongqing, PR China
2. Department of Civil and Architectural Engineering and Construction Management, University of Cincinnati, Cincinnati, OH, USA
3. Department of Communication, University of Louisville, Louisville, KY, USA
4. Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China