1. Assistant Professor, Dept. of Community and Regional Planning, Iowa State Univ., 399 College of Design, Ames, IA 50011; formerly, Research Scientist and Principal Transport Planner, Univ. of California, Los Angeles, 555 Westwood Plaza, Suite 185, Los Angeles, CA 90095 (corresponding author).
2. Associate Professor, School of Policy, Planning, and Development, Univ. of Southern California, Los Angeles, Ralph and Goldy Lewis Hall 311, Los Angeles, CA 90089-0626.