1. Senior Planner/Modeler, Southeastern Wisconsin Regional Planning Commission, W239 N1812 Rockwood Dr., P.O. Box 1607, Waukesha, WI 53187-1607 (corresponding author).
2. Associate Professor, Dept. of Civil Engineering, North Dakota State Univ., NDSU Dept. 2470, P.O. Box 6050, Fargo, ND 58018-6050.
3. Director of Program Development, Minnesota Dept. of Transportation, 395 John Ireland Blvd., St. Paul, MN 55155-1899.