Avoid certain street types

Question

Hi

I would like to avoid highways or main roads when doing "best route analysis" (impedance: shortest route). What is the best and easiest way to implement this restriction?

Thanks

AlexeyTereshenkov · Answer

Joe, good point.

I agree with Joe, the best way for you to get started is to become familiar with the concepts first. I bet you will find all your questions answered in the Help, it is very comprehensive.

ArcGIS Network Tutorial is available online at:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Exercise_1_Creating_a_network_dataset/00470000005t000000/

Or as .pdf file:
http://help.arcgis.com/en/arcgisdesktop/10.0/pdf/network-analyst-tutorial.pdf

Good luck.

JoeBorgione · Answer

To your suggestion "Place impedance values on them like low speed limits". How would you do that? By creating a new cost attribute? How would you then set the evaluators?

Thank you so much

I'm sorry, I don't have the time and this forum dosen't have the space for a complete description of Network Analysis.  Assuming you are using ArcGIS 10.x may I suggest you start here, and if you are using 9.3, take a look here.

There are a couple of tutorials out there too: just google network analyst tutorial and you'll find them.

Typically, the street centerline data I use in the network have various attributes that I can use in NA.  For example SpeedLimit.  With it you can do a calculation with the segment length to derive a 'cost' of travel time needed to traverse any given street segment.  In my case, I keep freeways at 65 mph; it sounds like you may want to knock them down to 1 mph, thus making traversing the freeway segments unattractive to the solver if travel time is to be minimized.

MartinaRagettli · Answer

To your suggestion "Place impedance values on them like low speed limits". How would you do that? By creating a new cost attribute? How would you then set the evaluators?

Thank you so much