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Roundabout Reconstruction Using Corridor + Grading Objects

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  • Event Year: Autodesk University 2008
  • Class ID: CV404-1
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  • Primary Speaker: Sean Twomey
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  • Class Information
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  • Primary Track: Civil Engineering
  • Primary Software: AutoCAD Civil 3D
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Class Audience

Road designers who are familiar with Civil 3D® Objects

Class Description

Our goal: turn a four-way Roundabout into a five-way Roundabout—same data as last year, more organized with significant improvements for the 2009 product...We'll build a Corridor to model the reconstruction required for adding a new lane to an existing Roundabout. This task involves rerouting an existing approach lane with new Horizontal Curves to slow traffic down and blending this into the Roundabout so that the new Exit Lane can be constructed with minimum disruption. We will achieve this with a combination of Civil 3D objects, while carefully controlling the Vertical Design to ensure that we adhere to design standards.

Class Highlights


  • Apply the “Fixed-Floating-Free” Civil 3D® Alignment Elements to practical scenarios

  • Take advantage of the “Transparent Commands” to highlight regions of interest on Profile Views

  • Establish max/min ranges to act as a guide for Design Profiles

  • Use Rehab Subassemblies to extend and overlay Existing Laneways

  • Combine all of the above into a Dynamic Corridor Model for analysis

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