I have a TransCAD highway network. How do I develop a highway network for STEAM?
Building a highway network from TransCAD is a little different than building a highway network from other travel demand modeling software platforms. Most packages require separate records be created for travel in the A-B and B-A link directions. But TransCAD uses a direction code (dir code) to denote the permitted directions of travel: 0 for 2-way, 1 for A-B direction travel only and -1 for B-A direction travel only. You will need to write GIS/DK code to create separate records for 2-way links or, after you’ve output your network (including the direction code) into a format suitable for further data manipulation, you will need to write a macro or program to perform the task. Remember to sort the highway network on the A node.
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