1. Postdoctoral Researcher, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47906.
2. Independent Transportation Consultant, 5305 Ashlar Village, Wallingford, CT 06492.
3. Associate Professor, Dept. of Civil, Architectural and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616 (corresponding author).
4. Graduate Research Assistant, Dept. of Civil, Architectural and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616.
5. Lecturer, Dept. of Traffic Engineering, Chang’an Univ., Xi’an 710064, P.R. China.