1. Professor of Civil Engineering and of Public Policy and Management, Kaprielian Hall Room 210, Univ. of Southern California, Los Angeles, CA 90089-2531 (corresponding author).
2. Professor of Policy, Planning, and Development, Ralph and Goldy Lewis Hall Room 216, Univ. of Southern California, Los Angeles, CA 90089-0626.
3. Research Associate, School of Policy, Planning and Development, Von Kleinsmid Center Room 382, Univ. of Southern California, Los Angeles, CA 90089-0041.