1. Research Engineer, Turner Fairbank Highway Research Center—Federal Highway Administration, Transportation Operations Concepts and Analysis Team, 6300 Georgetown Pike, McLean, VA 22101 (corresponding author).
2. Highway Research Engineer—National Research Council Research Associate, Office of Safety Research and Development, 6300 Georgetown Pike, McLean, VA 22101.
3. Team Leader, Transportation Operations Concepts and Analysis Team, Turner Fairbank Highway Research Center—Federal Highway Administration, 6300 Georgetown Pike, McLean, VA 22101.
4. Research Engineer, Turner Fairbank Highway Research Center—Federal Highway Administration, Office of Safety Research and Development, 6300 Georgetown Pike, McLean, VA 22101.