You are now ready to build the road network for the roads.shp shapefile.
The Road Network Builder utility saves the road network in a file with the same name as the original Shapefile or TAB file, but with the .rtn extension.
Click the 'Build road network...' button to start the building process. The following message appears when the road network is constructed:
The dialog box above shows statistics about the road network. The most important is the number of isolated segments. There may be a few road segments that are not connected to any other segment. But, if the number is high (100 or more), this may mean that the road map is not properly segmented and is not suitable for routing.
Click here to go to Step 5
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