1. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University4800 Cao'An RoadShanghaiPeople's Republic of China
2. School of Economics and Management, Tongji UniversityNo. 1 Zhangwu RoadShanghaiPeople's Republic of China
3. Department of Electrical EngineeringTsinghua UniversityEast‐Main BuildingBeijingPeople's Republic of China