Tech Tips

Creating a Mini-Roundabout

This Tech Tip explains how to add or create a mini-roundabout using the new roads strings model.



In Civil Designer 2014, there are 2 methods used internally for road design. The old method of using cross sections, and new method strings. The design method can be changed at anytime and any older project done in any previous version of Civil Designer can be converted to a string version of the road design. Junctions will only work if your road is using the strings method. The steps you follow for your road design are identical to all previous versions.

Add a Junction (mini-roundabout)

Roads Mode > Junctions Menu > Add Mini-Roundabout

The program will prompt

With the mouse indicate the First Intersecting Road of the mini-roundabout.

The intersecting road will be highlighted

Then select the Main Road of the mini roundabout

If you have a second intersection road you can now select it, or press ESC for a 3 way roundabout

In this example we will be adding a 3 way mini roundabout, so we press ESC.

If the roads have not been converted to strings, or you did not start your roads as a strings road ( i.e. you started the project in an older version of Civil Designer), the following dialog will appear. In this example the roads are not string roads

The roads will have to be converted if you wan to add a junction, so you will select Yes.

Mini-roundabout Design

The next step is to specify the various settings for the new mini-roundabout.

You can also change the intersecting and main roads if they were selected in error. You can reselect my using the mouse or selecting from the drop down.

You can also change the settings for the various radii of the mini-roundabout, the lane width, and also the crossfall. All these dialogs have extensive help, press F1 with the dialog open to get additional information.

You can also modify the settings used for the Center Island.

If you have mini-roundabout with the same settings in your project, you can also save the mini-roundabout details and then use them again, or create mini- roundabout libraries.

This is done via the Load, Save and Save As buttons

Once you are happy with all your settings, click OK.

The new mini-roundabout will be added to your project.

We used the incorrect settings for the radii, so no we can edit the junction and correct this.

Editing the Mini-roundabout

Roads Mode > Junctions Menu > Edit Junction

Click on the junction, the Roundabout Wizard dialog will appear.

We will select Mini-Roundabout Setup

We will change the radius (R).

Once the changes are made, click OK.

The mini-roundabout will be recalculated and the mini-roundabout will be updated to reflect the changes.

The updated mini-roundbout

Deleting the Mini-roundabout

You can also delete the mini-roundabout, if no longer required.

Roads Mode > Junctions Menu > Delete Junction

Indicate the junction, and the junction will be deleted.

Click Yes to delete the junction.

The original string roads without the mini-roundabout is shown.

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