1. Dept. of Civil Engineering and Technology, Old Dominion Univ., Kaufman Hall, Rm. 214, Norfolk, VA 23529; and, Virginia Tech Transportation Institute (VTTI), Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061 (corresponding author).
2. Virginia Tech Transportation Institute (VTTI), Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061.
3. Dept. of Civil Engineering and Technology, Old Dominion Univ., Kaufman Hall, Rm. 214, Norfolk, VA 23529.