1. Guangzhou Expressway Co., Ltd., 1800 S. Guangzhou Rd., Guangzhou, Guangdong 510288, China; formerly, Joint Graduate Student, Tongji Univ., Shanghai 201804, China; and Univ. of Tennessee, Knoxville, TN 37996.
2. Professor, School of Transportation Engineering, Tongji Univ., Shanghai 201804, China; and Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996 (corresponding author).
3. Research Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996.