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Hunt, J. D., R. R. Donnelly, J. E. Abraham, C. Batten, J. Freed- man, J. Hicks, P. J. Costinett, and W. J. Upton. 2001. Design of a Statewide Land Use Transport Interaction Model for Oregon. Proc., 9th World Conference for Trans- port Research (CD- ROM), Seoul, South Korea, July. Stefan, K. J., J. D. P. McMillan, and J. D. Hunt. 2005. Urban Commercial Vehicle Movement Model for Calgary, Alberta, Canada. In Transportation Research Record: Journal of the Transportation Research Board, No. 1921, Transportation Research Board of the National Academies, Washington, D.C., pp. 1â10. 7LEVELS OF DISAGGREGATION AND DEGREES OF AGGREGATE CONSTRAINT