1. Graduate Research Assistant, Virginia Tech Transportation Institute, Dept. of Civil and Environmental Engineering, Virginia Tech, 3500 Transportation Research Plaza, Blacksburg, VA 24061 (corresponding author).
2. Director, Center for Sustainable Transportation Infrastructure, Virginia Tech Transportation Institute Professor, The Charles Via, Jr. Dept. of Civil and Environmental Engineering, 3500 Transportation Research Plaza, Virginia Tech, Blacksburg, VA 24061-0105.
3. Senior Research Associate, Center for Sustainable Transportation Infrastructure, Virginia Tech Transportation Institute, 3500 Transportation Research Plaza, Blacksburg, VA 24061.
4. Virginia Center for Transportation Innovation and Research, 530 Edgemont Rd., Charlottesville, VA 22903.