What You Will Need levels) ArcUser Online 3. Add a third field; name it Minutes; and set its type to Double, with a precision of 12 and a scale of 6. This field stores calculated travel times for each segment. Click Apply and OK. Close ArcCatalog. Examining Distance and Speed, Street Class, Street Type Start ArcMap, turn on the Network Analyst extension, and make the Network Analyst toolbar visible. Open Redlands01.mxd and verify that all data layers have loaded properly, including the two layers that display the network streets. The Streets with Speed layer will be visible and the Streets with Speed and Direction layer will be unchecked. Doubleclick on any layers that have a red exclamation point, choose Properties > Source, and click Set Data Source to repair the path to the data. Switch from Layout View to Data View and open the attribute table for the Streets with Speed layer. Study all the fields for this layer. Verify that the three new fields are available and contain either zero values or no text. Inspect all fields and look for information that Continued on page 52 ArcUser This exercise will limit connectivity by merging freeway segments across city streets. These selected examples show connectivity. www.esri.com