1. School of Transportation, Southeast University, 2 Southeast University Rd., Nanjing 211189, People’s Republic of China (Corresponding author), e-mail: lg@seu.edu.cn, https://orcid.org/0000-0001-8157-3991
2. Department of Civil and Environmental Engineering, Rutgers, State University of New Jersey, 500 Bartholomew Rd., New Brunswick, NJ 08854, USA, https://orcid.org/0000-0001-8666-6900 (H.W.)
3. School of Transportation, Southeast University, 2 Southeast University Rd., Nanjing 211189, People’s Republic of China