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Hi, I'm using the Vehicle Tracking wizard to produce a roundabout geometric design (which generates the roundabout crowns to the Stockdale method). I have followed the numerous tutorials for this which include the generation of the corridor and then surface for the roundabout. The roundabout geometry is created from the previously designed horizontal alignments and vertical profiles. The issue I am continually experiencing in exaggerated undulation in the surface & subsequent crown profiles as they are draped over the generated surface. I have no idea why or how these are being generated this way. I have searched online and emailed various Autodesk webcast presenters asking for guidance to no avail. If anyone on here could offer any guidance it would be greatly appreciated. I have attached a PDF showing the results of my corridor & surface which illustrate the effect i am describing. Thanks in advance Gman1979 Windows 7 pr 64-bit AutoCAD Civil 3D 2015 Vehicle Tracking 2015 8GB Ram Intel Core i7 Roundabout Surface Errors.pdf