2.4.1 - Add Approach Lane
Step Description:
1. Ribbon Home tab > Create Design panel > Intersections > Add Approach

Add Approach Lane Image


You are prompted to select a location along the circular area of the roundabout.

2. Select a location along the circular area of the roundabout, and then press Enter.
You are prompted to select the alignment for the approach road. When you are finished selecting alignments, press Enter. The Create Roundabout - Approach Roads dialog box is displayed.

Create Roundabout - Approach Roads Image


3. Specify the desired parameters on the Create Roundabout - Approach Road dialog box, and then click the Next > button to proceed to the Islands dialog box.

Create Roundabout - Approach Roads dialog box Image


AutoCAD Civil 3D 2012 User's Guide reference:
User's Guide - Dialog Box Reference - Intersections and Roundabouts Dialog Boxes - Create Roundabout - Approach Roads Dialog Box

For more information watch the video below:
  • Create Roundabout (WMV)