1. Research Scientist, Virginia Tech Transportation Institute, Virginia Polytechnic Institute and State Univ., 3500 Transportation Research Plaza, Blacksburg, VA 24061-0536.
2. Professor, Charles Edward Via Jr. Dept. of Civil Engineering; Leader, Roadway Infrastructure Group, Virginia Tech Transportation Institute, Virginia Polytechnic Institute and State Univ., 200 Patton Hall, Blacksburg, VA 24061-0105.
3. Graduate Research Assistant, Bradley Dept. of Electrical and Computer Engineering and Virginia Tech Transportation Institute, Virginia Polytechnic Institute and State Univ., 3500 Transportation Research Plaza, Blacksburg, VA 24061-0536.