1. Graduate Research Assistant, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Raleigh, NC 27606-7908.
2. Professor, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Raleigh, NC 27606-7908.
3. Professor, Dept. of Civil, Construction, and Environmental Engineering. North Carolina State Univ., Raleigh, NC 27606-7908 (corresponding author).
4. Senior Research Associate, Institute for Transportation Research and Education, North Carolina State Univ., Centennial Campus Box 8601, Raleigh, NC 27695-8601.
5. Research Assistant, Institute for Transportation Research and Education, North Carolina State Univ., Centennial Campus Box 8601, Raleigh, NC 27695-8601.
6. Transportation Research Assistant, Univ. of Wyoming, 1000 E University Ave., Laramie, WY 82071.