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Parclo A4

That could be, however this is the only intersection I have this problem with. Its unfortunate, because I've always really liked this asset. I'll see if I can narrow it down further and let you know if I find anything additional.

Sounds more like an issue with the SmartIntersections mod rather than this asset.

I know this is an old asset, but I'm now getting this error after Airports DLC

SmartIntersections.SharedEnvironment.NetWrapperException: Cannot wrap nonexisting segment
at SmartIntersections.SharedEnvironment.WrappedSegment..ctor (SmartIntersections.SharedEnvironment.WrappedNode,SmartIntersections.SharedEnvironment.WrappedNode,uint16) <0x001a3>
at SmartIntersections.SharedEnvironment.WrappersDictionary.RegisterSegment (uint16) <0x0011c>
at SmartIntersections.Patches.LoadPathsPatch.AfterIntersectionBuilt (BuildingInfo) <0x0024a>
at (wrapper dynamic-method) BuildingDecoration.BuildingDecoration.LoadPaths_Patch1 (BuildingInfo,uint16,Building+,single) <0x02016>
at (wrapper dynamic-method) BuildingTool.BuildingTool.CreateBuilding_Patch1 (BuildingTool,BuildingInfo+,UnityEngine.Vector3,single,int,bool,bool) <0x0038f>
at BuildingTool/<CreateBuilding>c__Iterator0.MoveNext () <0x0056e>
at AsyncTask.Execute () <0x000a8>

Great !!. Now you won't need to ask me for another interchange. Next one an inverted cloverleaf

Awesome!