1. Professor, Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an Univ., Xi’an, Shaanxi 710064, PR China (corresponding author).
2. Ph.D. Candidate, Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an Univ., Xi’an, Shaanxi 710064, PR China.
3. Engineer, Hangzhou Transportation Development Guarantee Center, No. 769, Wenyi West Rd., Xihu District, Hangzhou, Zhejiang 310030, PR China.
4. Engineer, Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., 576 Wuying Shanxi Rd., Tianqiao District, Jinan, Shandong 250031, PR China.