1. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, School of Transportation Engineering, Tongji University, Shanghai 201804, China
2. National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804, China
3. C2SMART Center, Department of Civil and Urban Engineering, Tandon School of Engineering, New York University, New York, NY 11201, USA
4. Baidu Inc., Beijing 100085, China