1. Visiting Assistant Professor, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907; and, Research Program Manager, Center for Road Safety, 1435 Win Hentschel Blvd., West Lafayette, IN 47906 (corresponding author).
2. Assistant Professor, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907.
3. Associate Professor, School of Civil Engineering, National Technical Univ. of Athens, Zografou Campus, Heroon Polytechniou 9, 15780 Zografou, Greece.
4. Charles Pankow Professor of Civil Engineering, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907; and, Associate Director, Center for Road Safety, 1435 Win Hentschel Blvd., West Lafayette, IN 47906.