1. Assistant Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907. E-mail: rconnor@purdue.edu
2. Senior Research Engineer, ATLSS Engineering Research Center, Lehigh Univ., Bethlehem, PA 18015. E-mail: ek02@lehigh.edu
3. Professor Emeritus, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015. E-mail: jwf2@lehigh.edu
4. Research Engineer, FHWA Turner Fairbanks Research Center, 6300 Georgetown Pike, McLean, VA 22101. E-mail: bill.wright@fhwa.dot.gov