1. Room 416D, Number 1720, Institute of Transportation Studies, University of California, Berkeley, McLaughlin Hall, Berkeley, CA 94720-1720.
2. Department of Civil and Environmental Engineering, Pennsylvania State University, 223A Sackett Building, University Park, PA 16801.
3. Room 416C, Number 1712, Institute of Transportation Studies, University of California, Berkeley, McLaughlin Hall, Berkeley, CA 94720-1720.