1. Visiting Assistant Professor of Civil Engineering, and Research Program Manager of the Center for Road Safety, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907 (corresponding author).
2. Assistant Professor of Civil Engineering, Massachusetts Institute of Technology, E1-175, 77 Massachusetts Ave., Cambridge, MA 02139.
3. Research Scientist, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907.
4. Associate Professor of Civil Engineering, National Technical Univ. of Athens, Heroon Polytechniou 9, 15780 Zografou, Greece.
5. James Mason Crafts Professor of Systems Engineering and Civil and Environmental Engineering, Massachusetts Institute of Technology, E1-175, 77 Massachusetts Ave., Cambridge, MA 02139.