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What is the most common SETTING for the Layer Properties when creating time-travel polygons?

I am in the process of creating 4, 5, 6 minute polygons using Network Analyst. Every time I generate these polygons they have different shapes.

I would like to be consistent from one year to another based on the number of streets that are being added to our Center Line Street Network.

Using ArcInfo – 9.1 SP #1

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I would recommend having a look at how Esri have designed their model that sits behind their service area task (drive time polygons).

Info about the model can be seen here, although to get more information, you can download the model from your ArcGIS Desktop installation media (under ArcTutor folder) and open it up to pick out the specific settings.

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