1. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 1173 Glenn Martin Hall, College Park, MD 20742.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742.
3. Assistant Professor, Dept. of Civil, Environmental and Infrastructure Engineering, George Mason Univ., 4400 University Drive, MS6C1, Fairfax, VA 22030 (corresponding author).
4. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742.
5. Undergraduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742.
6. Team Leader, Travel Forecasting and Analysis Division, Office of Planning and Preliminary Engineering, Maryland State Highway Administration.