1. Research Associate, Virginia Tech Transportation Institute, 3500 Transportation Research Plaza (0536), Blacksburg, VA 24061. E-mail: mfarzane@vt.edu
2. Associate Professor, Charles Via, Jr. Dept. of Civil and Environmental Engineering, and Director, Center for Sustainable Mobility, Virginia Tech Transportation Institute, 3500 Transportation Research Plaza (0536), Blacksburg, VA 24061. E-mail: hrakha@vt.edu