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Using ArcGIS 9.3 to try and create some routes with network analyst... currently following this tutorial: Network analyst tutorial for 9.3

I have a street dataset from NYS clearinghouse. I can't seem to figure out how to add the FT_minutes attribute. Not sure if I can build routes based on time without it. Any ideas? Is it possible? Thanks!

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Calculate length of each segment then assign an average speed to the class of each (minor is less, highways are more) use Field Calculator for new fields FT & TF Minutes = Distance/KPH or MPH. your need FT_minutes & TF_minutes for two-way traffic. – Mapperz♦ May 6 '11 at 4:34
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Are you having issue with assigning the attribute to the line features, or within the Network Dataset? – eric May 9 '12 at 23:47

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