1. Visiting Postdoctoral Researcher, California Partners for Advanced Transit and Highway (PATH) Program, Institute of Transportation Studies, Univ. of California, Irvine, CA 92697-3600.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Utah State Univ., Logan, UT 84322-4110; formerly, Visiting Postdoctoral Researcher, California Partners for Advanced Transit and Highway (PATH) Program, Institute of Transportation Studies, Univ. of California, Irvine, CA 92697-3600.
3. Professor, Dept. of Civil and Environmental Engineering, Institute of Transportation Studies, Univ. of California, Irvine, CA 92697-3600.
4. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, CA 95616.