Drive time analysis with ArcGIS Network Analyst?

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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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