1. Senior Research Associate, Institute for Transportation Research and Education, North Carolina State Univ., Centennial Campus Box 8601, Raleigh, NC 27695-8601 (corresponding author).
2. Professor, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., 423 Mann Hall, Raleigh, NC 27695-7908.
3. Professor, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., 200 Mann Hall, Raleigh, NC 27695-7908.
4. Research Assistant, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., 423 Mann Hall, Raleigh, NC 27695-7908.