1. Postdoctoral Research Associate, Texas A&M Transportation Institute, Texas A&M Univ., College Station, TX 77843.
2. Assistant Professor, Mechanical Engineering Program, Masdar Institute of Science and Technology, P.O. Box 54224, Abu Dhabi, United Arab Emirates (corresponding author).
3. Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843; and Professor, Mechanical Engineering Program, Texas A&M Univ. at Qatar, P.O. Box 23874, Doha, Qatar.
4. Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843.