1. Assistant Professor, Dept. of Civil Engineering, Univ. of Minnesota, 500 Pillsbury Dr. S.E., Minneapolis, MN 55455 (corresponding author).
2. Postdoctoral Researcher, California Center for Innovative Transportation, Institute of Transportation Studies, Univ. of California, 2105 Bancroft Way, Suite 500, Berkeley, CA.
3. Ph.D. Student, Dept. of Civil Engineering, Univ. of Minnesota, 500 Pillsbury Dr. S.E., Minneapolis, MN 55455.
4. Professor, Dept. of System and Industrial Engineering, Univ. of Arizona, 1127 E. James E. Rogers Way, Tucson, AZ 85721.