1. Sr. Research Officer, Policy Planning and Research Div., Ontario Ministry of Transportation and Communications, Downsview, Ontario, Canada
2. Prof. of Engrg. and Special Asst. to the Pres., Technical Univ. of Nova Scotia, Halifax, Nova Scotia, Canada
3. Mgr., Civ. Engrg. Development, Built Works Tech., Dept. of Public Works, Ottawa, Ontario, Canada