The spline mesh is curved but collisions are not.
To fix this problem I tried to use complex collisions as simple but complex collisions are not working in splines.
If the collision has multiple splits, Unreal Engine will deform the collision mesh similarly how to the mesh deforms.
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Simple collision doesn’t have multiple splits, it is generated by Unreal Engine. Only complex collisions have multiple splits.
You can create your own custom simple collision in a 3d modeling program, with multiple splits, and it will deform with splines.
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Thanks for your help. I created custom simplified collision within Unreal engine by scalling and moving simple collisions.
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Thank you, creating manually in UE is the only thing that worked for me.
Designing a custom collision in a 3D app does not appear to work for certain shapes (such as roads). No matter what I tried, the collision mesh is modified on import to make it useless.