In a network dataset, drive-time attributes are used to measure and model impedances, such as travel time. In many cases, street networks have the necessary elements for a drive-time field. The instructions provided describe how to calculate a drive-time attribute in ArcGIS Network Analyst.
To calculate a drive-time cost attribute in ArcGIS Network Analyst, the following data are required:
Add a new double field for the street data using the Field Calculator and one of the following formulas based on the street's units of length.
In most cases, the Shape_Length attribute can be used as the length and the units are defined by the projection.