1. Professor of Management and Professor of Information & Decision Sciences, Univ. of Illinois at Chicago, 601 S Morgan St. (MC 243), Chicago IL 60607-7123 (corresponding author).
2. Transit Research Analyst, Chicago Transit Authority, 567 W. Lake St., Chicago IL 60661.
3. Professor of Civil & Environmental Engineering; and, Professor of Urban Affairs and Public Policy, Univ. of Delaware, 301 Dupont Hall, Newark, DE 19716.