Hi, yes it is possible to scale only the road mesh, steps are:
- In the Content Browser duplicate road mesh(Ctrl+W)
- Open duplicated mesh in Static Mesh Editor (Double Left Click)
- In the details window go to the LOD 0 section -> Build Settings and adjust Build Scale Y paremeter
- Click Apply Changes at the bottom of the LOD 0 section.
- Save the mesh and assign it to a spline.
- Done.
Intersections can be scaled in the same way.
I will add ScaleY paremeter in the upcoming update for easy scaling.