1. Research Associate, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Louisiana Transportation Research Center, 4101 Gourrier Ave., Baton Rouge, LA 70808.
2. Irma Louise Rush Stewart Distinguished Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Louisiana Transportation Research Center, 4101 Gourrier Ave., Baton Rouge, LA 70808 (corresponding author).
3. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Louisiana State Univ., 4101 Gourrier Ave., Baton Rouge, LA 70808.