1. Senior Research Associate, Center for Sustainable Transportation Infrastructure, Virginia Tech Transportation Institute, 3500 Transportation Research Plaza, Blacksburg, VA 24061 (corresponding author).
2. Associate Professor, Département Génie Civil, Ecole Nationale d’ingénieur de Tunis, ENIT, B.P. 37 Le Belvédère 5, 1002 Tunis, Tunisia.
3. Associate Professor, Dept. of Civil Engineering, Lebanese American Univ., P.O. Box 36, Byblos, Lebanon.
4. Professor, Charles Via, Jr. Dept. of Civil and Environmental Engineering, Virginia Tech, 200 Patton Hall, Blacksburg, VA 24061; Director, Center for Sustainable Transportation Infrastructure, Virginia Tech Transportation Institute, 3500 Transportation Research Plaza, Blacksburg, VA 24061.