1. Graduate Research Assistant, Zachry Dept. of Civil Engineering, Texas A&M Univ., 3135 TAMU, College Station, TX 77843-3135 (corresponding author).
2. Assistant Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., 3135 TAMU, College Station, TX 77843-3135.
3. Senior Research Scientist, Texas A&M Transportation Institute, Texas A&M Univ., 3135 TAMU, College Station, TX 77843-3135.