1. Research Assistant, Automotive Transportation Technology Research Center, Research Institute of Highway Ministry of Transport, Beijing 100088, China.
2. Professor, School of Transportation Science and Engineering, Beihang Univ., Beijing 100191, China (corresponding author). ORCID: .
3. Assistant Professor, Dept. of Civil Engineering, Univ. of Texas at El Paso, El Paso, TX 79968.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Washington, Seattle, WA 98105. ORCID: .