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I'm using ArcGIS 10.1 Network Analyst Extension to try and do a drive time analysis for fire station service areas.

Using this tutorial I am going through step by step to make this happen, however, I am unable to create the analysis using drive time as an impedance and can only choose distance as an option:

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My road network dataset has a field that shows the time it would take to traverse the segment at 40mph.

How do I enable DriveTime as an option in my analysis settings?

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Your Network Dataset requires the Cost/Attribute in the Function Evaluator (when building your network)

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You can see here there are 4 types of attribute (Minutes will build your drive time analysis buffers)

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See Types of evaluators used by a network

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Types_of_evaluators_used_by_a_network/00470000000n000000/

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