How to restrict portions of road network from the analysis in ArcGIS 10 Network Analyst?

Question

I'm trying to sort out network analysis in ArcGIS 10.

Toy example of finding shortest distance between two points looks something like that :

Where squares are two locations, and the green line is an output from Closest Facility tool.

What I need to do, is to restrict motorways and slip roads from the analysis. So the new route should avouid the red segments:

What is the best strategy to proceed in such case?

Should I edit my network and delete all the segments I do not want to have in analysis? Or perhaps use linear Barriers?

Thanks for help!

Answer 1

There is more than one solution to this problem.

This is a way that I would recommend:.

Assuming ArcMap is your primary tool:

1. Open the attribute table of the network source features.

2. Add a field of type "Short" (any integer type will do). This will effectively be a boolean value. Give it a name that would describe it as a restriction.

3. For each road segment that meets your restriction parameters (i.e. motorways, slip roads) calculate that row's restriction value to be 1. All segments with a zero (or NULL) restriction value will be traversable.

4. Add this value as a network restriction attribute and use a "field evaluator". You will need to "rebuild" your network. (Alternatively, use the New Network Dataset Wizard to create a new network dataset)

Supplementary information:

• Creating a network dataset: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Creating_a_network_dataset/00470000000w000000/

• Using parameters with network attributes: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Using_parameters_with_network_attributes/00470000000s000000/

Feel free to ask for clarification if you run into any difficulty =)