1. Prof., Dept. of Civ. Engrg., North Carolina State Univ., Box 7908, Raleigh, NC 27695.
2. Former Mgr., Geographic Information Sys. Unit, North Carolina Dept. of Transp., P.O. Box 25201, Raleigh, NC 27611.
3. Mgr., Statewide Plng. Branch, North Carolina Dept. of Transp., P.O. Box 25201, Raleigh, NC.
4. Asst. Prof., Dept. of Constr. Engrg., Mat. Engrg. and Industrial Des., Western Michigan Univ., Kalamazoo, MI 49008.
5. Mgr., Geographic Information Sys. Unit, North Carolina Dept. of Transp., P.O. Box 25201, Raleigh, NC.