1. Assistant Professor, Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., 212 Sackett Building, University Park, PA 16802. E-mail: gchehab@engr.psu.edu
2. Senior Researcher, Highway and Transportation Technology Institute, Korea Highway Corporation, 445-812, Republic of Korea. E-mail: seoyg89@freeway.co.kr
3. Professor, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Raleigh, NC 27695-7908, E-mail: kim@ncsu.edu