Outline Road
It allows the user to create a road by using more than two user-defined outline curves. At that time, the number of point data of outline curves should be same. The operation is same to Outline Surface.
Spline Road
It allows the user to create a road by using more than two user-defined spline curves. At that time, the number of point data of spline curves should be same. The operation is same to Spline Surface.
Face Road
It allows the user to create a road directly from the created geometry such as a surface and a solid geometry. For references, the extracted face surfaces can be used for the road. he operation is same to Face Surface.