1. Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ. and Southern Univ., Baton Rouge, LA 70803.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana Tech Univ., Ruston, LA 71272.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ. and Louisiana Transportation Research Center, Baton Rouge, LA 70803.
4. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Louisiana State Univ. and Southern Univ., Baton Rouge, LA 70803.