1. Assistant Professor, School of Transportation and Logistics, Dalian Univ. of Technology, Dalian 116024, China.
2. Professor, School of Transportation and Logistics, Dalian Univ. of Technology, Dalian 116024, China.
3. Research Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996.
4. Professor, School of Transportation Engineering, Tongji Univ., Shanghai 201804, China; Edwin G. Burdette Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996 (corresponding author).