1. Beijing Engineering Research Center of Urban Transport Operation Guarantee, Beijing Univ. of Technology, Chaoyang, Beijing, China.
2. Beijing Engineering Research Center of Urban Transport Operation Guarantee, Beijing Univ. of Technology, Chaoyang, Beijing, China; Beijing General Municipal Engineering Design and Research Institute Co., Ltd., Haidian, Beijing, China.
3. CCCC First Highway Engineering Group Co., Ltd., Chaoyang, Beijing, China.
4. Beijing Engineering Research Center of Urban Transport Operation Guarantee, Beijing Univ. of Technology, Chaoyang, Beijing, China (corresponding author).Email: