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I am wondering if there is a way for me to create 3D divided highways in Blender using Nurbs curves?

Here is a sample image of a divided highway, as shown in the interchange:

enter image description here

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    $\begingroup$ Hi, please describe a bit more your project: I guess you are not trying to reproduce exactly such image above... why you need specifically nurbs curves? I think you could have an easier path using just curves (splines), with an extrude amount, eg. $\endgroup$ – m.ardito Nov 5 '17 at 8:51
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You cannot extrude a complete branch from a vertex mid curve but you can extrude (E-key) a single vertex out (t just hangs loose from the main body of the curve), then extrude it back to the fork location.

curve extrude

move the vertex back to fork

Use another curve object that is just a small straight line to bevel the shape of the road.

Bevel shape of road curve

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