I have seen several old post regarding this issue. They say it can be done using the LaneFromTaperedMedian subassembly, and that there is a webcast explaining it. I have checked with Autodesk, and the webcast is no longer available. Does anyone out there have any detailed instructions as to how to accomplish this. I'll attach an image of my median.
Randy A. Owens Southland Engineering, Inc. Win 7 64BIT C3D 2013