Road markings are defined in the standard and placed automatically. However, they can be adjusted in Roundabout Properties.
Click Road Markings in the left hand pane. The Road Markings page is displayed.
The markings are grouped by arm and location. Click the [+] adjacent to an arm to list the marking locations.
Highlight a marking and click the Edit button to make changes to individual markings.
Use the Select All and Clear All buttons to select or clear all the check boxes.