Here is one answer from Hitech to how you set a road or river as static and not resupply.
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There is a check box visual only, then they will not effect strat in any way. And nothing will automatically travel down them.
HiTech
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Maybe we need to post his answers to our PM's here to collect all of his instructions in one place.
Here are answers so far to my questions.------------------------------
1. It is a simple as create all roads.
2. Then check for errors occasionally one will travel over a square object and you just have to make it go around by moving a few points.
3. Build the clutter mask, this removes treas and grass from all roads/rivers/trains .
4. Build terrain and you are finished.
Any thing else you do is simply esthetic, I.E. you may not wish them to go straight up a mountain.
HiTech
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The create all button will wipe out the rivers, but if you Create Roads only then only all roads are wiped out, and similarly with Create Trains.
HiTech
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Btw you also can delete a road and then simply create it by hand, look at an existing road that was auto created to see the setting in the properties dialog to make it a field supply or a strat stupply.
HiTech
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Here is how to use the spline from setting a road segment to enhance the capabilities of the bulldozer tool. Delete the road after you click on plow terrain. He wrote bulldozer, he meant the plow terrain button.-------------------------------
You all ready can do that, simply create the spline road, set the alt of the terrain at the beginging and end of the path, press bull doze.
HiTech
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Before and after setting a road then plowing the terrain. Inland I raised a small hill above 500ft as the end of the spline path.