Update March 5,2016
Three tools was published.
Create crossroads with overlapped faces of two roads.
Create a surface with splines parallel with each other.
Create a surface with parallel splines
1.Create stair with style lines which can be splines or inner edges of selected faces of polygon 2.Pave steps along a curve path.
Create Stair by parallel splines
Create Stair by split polygons
Pave stair along a curve