1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70808.
2. Research Professor, Louisiana Transportation Research Center, Louisiana State Univ., 4101 Gourrier Ave., Baton Rouge, LA 70808.
3. Research Associate, Louisiana Transportation Research Center, Louisiana State Univ., 4101 Gourrier Ave., Baton Rouge, LA 70808.