1. Research Scientist, Advanced Transportation Research and Engineering Laboratory, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 1611 Titan Dr., Rantoul, IL 61866.
2. Founder Professor of Engineering and Director of Illinois Center for Transportation, Advanced Transportation Research and Engineering Laboratory, Director, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews MC-250, Urbana, IL 61801.
3. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews MC-250, Urbana, IL 61801.