1. Beijing Urban Transportation Infrastructure Engineering Technology Research Center, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2. Institute of Transportation Engineering, Tsinghua University, Beijing 100084, China
3. Parsons Transportation Group, 100 Broadway, New York, NY 10005, USA
4. New Jersey Department of Transportation (NJDOT), 1035 Parkway Avenue, Trenton, NJ 08625, USA