1. Post-doctoral Research Associate, Center for Transportation Research, Univ. of Tennessee, 600 Henley St., Knoxville, TN 37996 (corresponding author).
2. Professor, Center for Transportation Research, Univ. of Tennessee, 600 Henley St., Knoxville, TN 37996.
3. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, 72 Perkins Hall, Knoxville, TN 37996.
4. Research Scholar, Federal Highway Administration Traffic Operation R&D, 6300 Georgetown Pike, McLean, VA 22101.