1. Research Associate, TechMRT: Multidisciplinary Research in Transportation, Texas Tech Univ., Lubbock, TX 79409-1023.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Texas Tech Univ., Lubbock, TX 79409-1023 (corresponding author).
3. Associate Professor, Dept. of Civil and Environmental Engineering, Texas Tech Univ., Lubbock, TX 79409-1023.
4. Associate Professor, Dept. of Civil and Environmental Engineering, Virginia Military Institute, Lexington, VA 24450.