1. Senior Transportation Systems Engineer, Parsons Brinckerhoff, 434 Fayetteville St., Suite 1500, Raleigh, NC 27601 (corresponding author).
2. Director, ITRE, Professor of Civil Engineering, North Carolina State Univ., Centennial Campus Box 8601, Raleigh, NC 27695-8601.
3. Professor of Statistics, North Carolina State Univ., SAS Hall 5210, NCSU Campus Box 8203, Raleigh, NC 27695-8203.