1. Visiting Assistant Professor, School of Civil Engineering, Research Program Manager, Center for Road Safety, Purdue Univ., West Lafayette, IN 47907 (corresponding author).
2. Associate Professor of Civil Engineering, Purdue Univ., West Lafayette, IN 47907.
3. Project Associate, Agile Assets Inc., 6212 Shanda Dr., Raleigh, NC 27609.
4. Charles Pankow Professor of Civil Engineering, Associate Director, Center for Road Safety, Purdue Univ., West Lafayette, IN 47907.