1. Department of Construction Management, College of Technology, University of Houston, Houston, TX, USA
2. Institute of Transportation Studies, University of California, Davis, CA, USA
3. Lyles School of Civil Engineering, Purdue University, West Lafayette, IN, USA
4. Department of Civil Engineering and Environmental Engineering, University of California, Davis, CA, USA
5. Department of Geography, The University of Hong Kong, Hong Kong, Peoples Republic of China
6. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA