1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 1173 Glenn Martin Hall, College Park, MD 20742.
2. Research Associate, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 1173 Glenn Martin Hall, College Park, MD 20742.
3. Assistant Professor, Dept. of Civil, Environmental, and Infrastructure Engineering, George Mason Univ., MS 6C1, Fairfax, VA 22030.
4. Team Leader, Travel Forecasting and Analysis Division, Office of Planning and Preliminary Engineering, Maryland State Highway Administration, 707 N. Calvert St., Baltimore, MD 21202.
5. Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 1173 Glenn Martin Hall, College Park, MD 20742.
6. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 1173 Glenn Martin Hall, College Park, MD 20742 (corresponding author).