Exercise 5: Working with Roundabout Design Standards and Presets

In this exercise, you save a group of geometric parameters as a preset that can be quickly applied to a roundabout.

Presets are saved in a design standards file, the contents of which you will examine at the end of this exercise.

Select a a baseline roundabout

1. Open Roundabout-Preset.dwg..
2. Click Modify tab Design panel Intersection  Find.
3. Click Intersection tab Modify Roundabout panel Edit Roundabout  Find.
4. Click the Roundabout_ISLAND alignment.
   

Specify circulatory road presets

1. In the Create Roundabout - Circulatory Road dialog box, under Predefined Parameters to Import, click .
2. In the Preset - Add dialog box, under Preset Name, enter R = 40.
3. Under Roundabout Parameters, enter the following parameters:
   • Outer Radius: 40
   • Circulatory Road Width: 10
   • Apron Width: 3
4. Under Markings Parameters, enter the following parameters:
   • Outer Offset: 0.5
   • Inner Offset: 0.5
   • Marker Line Width: 0.3
   • Number of Lanes to Mark: 3
   • Lane Marker Width: 0.2
   • Lane Marker Linetype: DASHED
5. Click OK.
   Note:
   

   In the Create Roundabout - Circulatory Road dialog box, under Drawing Standard, the Roundabout Drawing Standard File is the xml file in which the presets are stored. You will examine the contents of this file at the end of this exercise.
6. At the bottom of the dialog box, click Next.

Specify approach road presets

1. In the Create Roundabout - Approach Roads dialog box, under Predefined Parameters to Import, click .
2. In the Preset - Add dialog box, under Preset Name, enter R = 40.
3. Under Approach Road Parameters, enter the following parameters:
   • Exit Road Width: 5
   • Exit Radius: 25
   • Exit Flare Length: 80
   • Exit Flare Type: Line
   • Width at Departure: 4.5
   • Entry Road Width: 4.5
   • Entry Radius: 20
   • Entry Flare Length: 80
   • Entry Flare Type: Line
   • Width at Approach: 4.25
4. Click OK.
5. In the Create Roundabout - Approach Roads dialog box, click Apply to All.
6. At the bottom of the dialog box, click Next.

Specify island presets

1. In the Create Roundabout - Islands dialog box, under Predefined Parameters to Import, click .
2. In the Preset - Add dialog box, under Preset Name, enter R = 40.
3. Under Construction Triangle Parameters, enter the following parameters:
   • Length: 60
   • Base: 4.5
4. Under Splitter Island Parameters, enter the following parameters:
   • Provide Crosswalk (Length): 3
   • Rounding at Exit: 1
   • Offset from Circle at Exit: 1
   • Offset at Exit: 0.5
   • Offset at Departure: 0.3
   • Rounding at Tip: 0.25
   • Island Total Length: 15
   • Island Base Length: 8
   • Rounding at Entry: 1
   • Offset from Circle at Entry: 0.5
   • Offset at Entry: 0.5
   • Offset at Approach: 1
   • Rounding at Crosswalk: 0.5
5. Click OK.
6. In the Create Roundabout - Islands dialog box, click Apply to All.
7. At the bottom of the dialog box, click Next. Click Finish.
   The roundabout is updated to reflect the parameters that you defined for the preset. When you create another roundabout, the presets that you defined will be available.
   

Examine the roundabout design standards file

1. Open the Autodesk Civil 3D Metric Roundabouts Presets.xml with your default Internet browser.
2. Under RoundaboutPresets StandardPresets US standardType=”EN-US”, examine the contents of the following blocks:
   • RoundaboutPreset name=”R = 40”
   • ApproachPreset name=”R = 40”
   • IslandsPreset name=”R = 40”
   These blocks contain the parameters you entered earlier in this exercise. If you are familiar with XML code, you can edit this file directly to add presets without using the Preset - Add dialog box in AutoCAD Civil 3D.
3. Close Windows Explorer and your Internet browser.

Edit a preset

1. Click Intersection tab Modify Roundabout panel Edit Roundabout  Find.
2. Click the Approach_SN alignment.
   
3. In the Create Roundabout - Approach Roads dialog box, under Predefined Parameters to Import, select R = 40. Click .
4. In the Preset - Edit dialog box, under Approach Road Parameters, change the following parameters:
   • Entry Road Width: 9
   • Entry Flare Type: Arc
5. Click OK.
6. At the top of the Create Roundabout - Approach Roads dialog box, use the drop-down list to select South to North Approach (1).
7. Under Predefined Parameters to Import, select R = 40.
8. At the bottom of the dialog box, click Next twice. Click Finish.
   The approach roads to the north and south of the roundabout are updated to reflect the updated preset. The other approach roads were not affected because you did not apply the new preset to them.
   

Delete a preset

1. Click Intersection tab Modify Roundabout panel Edit Roundabout  Find.
2. Click the Approach_SN alignment.
3. In the Create Roundabout - Approach Roads dialog box, under Predefined Parameters to Import, select R = 40. Click .
   The preset is removed from the list.
4. Under Predefined Parameters to Import, select RG = 12. Click .
   The preset cannot be deleted because it was shipped with AutoCAD Civil 3D. Only user-defined presets may be edited or deleted.
5. Click OK.
6. In the Create Roundabout - Approach Roads dialog box, click Cancel.