1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061.
2. Research Associate, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061.
3. Research Scientist, Virginia Council for Transportation Innovation and Research, Charlottesville, VA 22903.
4. Associate Principal Research Scientist, Virginia Council for Transportation Innovation and Research, Charlottesville, VA 22903.
5. Professor, Charles E. Via, Jr. Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061 (corresponding author).