1. Assistent Research Scientist, Dept. of Mechanical Engineering, Texas A&M Univ. at Qatar, P.O. Box 23874, Doha, Qatar (corresponding author).
2. Assistent Research Scientist, Texas A&M Transportation Institute, Texas A&M Univ., 3135 TAMU, College Station, TX 77843-3135.
3. Assistant Dean for Research and Graduate Studies, Director of TAMUQ Research Operations, Professor of Mechanical Engineering, Dept. of Mechanical Engineering, Texas A&M Univ. at Qatar, P.O. Box 23874, Doha, Qatar.
4. Regents Professor, E.B. Snead Chair Professor of Transportation and Civil Engineering, Zachry Dept. of Civil Engineering, Texas A&M Univ., 3135 TAMU, College Station, TX 77843-3135.