1. Assistant Professor, Public Works Engineering Dept., Mansoura Univ., Mansoura, Egypt; and Adjunct Faculty, Dept. of Civil Engineering, Univ. of Idaho, P.O. Box 441022, Moscow, ID 83844-1022 (corresponding author).
2. Professor, Dept. of Civil Engineering, Univ. of Idaho, P.O. Box 441022, Moscow, ID 83844-1022.
3. Graduate Student, Texas Transportation Institute, Texas A&M Univ. System, College Station, TX 77843-3135.