1. Irma Louise Rush Stewart Distinguished Professor, Dept. of Civil and Environmental Engineering and Louisiana Transportation Research Center, Louisiana State Univ., 4101 Gourrier Ave., Baton Rouge, LA 70808 (corresponding author).
2. Associate Director, Louisiana Transportation Research Center, 4101 Gourrier Ave., Baton Rouge, LA 70808.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., 3504 Patrick Taylor Hall, Baton Rouge, LA 70803.