1. Center for Sustainable Transportation Infrastructure (CSTI), Virginia Tech Transportation Institute (VTTI), Blacksburg, VA 24061, US.
2. Director, CSTI, VTTI, Blacksburg, VA 24061, US
3. Dept. of Civil and Environmental Engineering, Virginia Polytechnical Institute and State Univ., Blacksburg, VA 24061, US.
4. Virginia Center for Transportation Innovation and Research, Charlottesville, VA 22903-2454, US.