1. The representatives of a system having properties and operations that duplicate those of the original system in characteristics of interest. An analytical tool (often mathematical) used by transportation planners to assist in making forecasts of land use, economic activity, travel activity and their effects on the quality of resources such as land, air and water. _x000D_ 2. A mathematical or numerical description of an object or pheonmenon that shares important characteristics with the object or phenomenon.

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