1. Virginia Tech Transportation Institute, 3500 Transportation Research Plaza, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0105.
2. Transport Research Laboratory, Crowthorne House, Nine Mile Ride, Wokingham, Berkshire RG40 3GA, United Kingdom.
3. Virginia Center for Transportation Innovation and Research, 530 Edgemont Road, Charlottesville, VA 22903.