1. Ph.D. Candidate, College of Transportation Engineering, Tongji Univ., Shanghai 201804, China.
2. Professor, School of Transportation Engineering, Tongji Univ., Shanghai 201804, China; Associate Director, The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Shanghai 201804, China (corresponding author).
3. Professor, Lyles School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907.
4. Ph.D. Candidate, Lyles School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907.
5. Lyles School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907.