1. Senior Planner/Modeler, Southeastern Wisconsin Regional Planning Commission, W239 N1812 Rockwood Dr., P.O. Box 1607, Waukesha, WI 53187-1607; formerly, Research Assistant, North Dakota State Univ., Fargo, ND 58018 (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.
4. Ph.D. Candidate, E.I.T., Dept. of Civil Engineering, Univ. of Nebraska-Lincoln, N104 SEC/P.O. Box 886105, Lincoln, NE 68588-6105; formerly, Research Assistant, North Dakota State Univ., Fargo, ND 58018.