1. Assoc. Res. Prof., School of Engrg. and Appl. Sci., and Dir., FHWA/NHTSA Nat. Crash Analysis Ctr., George Washington Univ., Virginia Campus, 20101 Academic Way, Ashburn, VA 20147.
2. Res. Sci., FHWA/NHTSA Nat. Crash Analysis Ctr., George Washington Univ., Virginia Campus, 20101 Academic Way, Ashburn, VA.
3. Assoc. Prof., School of Engrg., and Appl. Sci., George Washington Univ., Virginia Campus, 20101 Academic Way, Ashburn, VA.