1. Lecturer, College of Information Engineering, Fuyang Normal Univ., Fuyang, Anhui 236041, China; Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an Univ., Xi’an, Shaanxi 710064, China.
2. Ph.D. Candidate, School of Highway, Chang’an Univ., Xi’an, Shaanxi 710064, China; Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an Univ., Xi’an, Shaanxi 710064, China (corresponding author).