1. Engineering Research Center for Transportation Safety, Ministry of Education, 125, 1040 Heping Road, 430063, Wuhan, China
2. Intelligent Transport System Research Center, Wuhan University of Technology, 125, 1040 Heping Road, 430063, Wuhan, China.
3. Department of Civil, Environmental and Construction Engineering, University of Central Florida, Engineering II 301-A, Orlando, FL 32816-2450.