Roundabout Properties: Road Marking

Select a marking in the right hand pane and click Edit. The Road Marking dialog is displayed.

Select Enabled to display this marking.

Note: If you disable a marking in Roundabout Properties that is defined as mandatory in the standard a design check exception will be generated.

Enter a Name for the marking.

You cannot edit the marking Type and this will be displayed alongside the name in the tree view in the Markings page.

Different markings will have different parameters enabled.

Lateral Offset is the offset of the marking across the road or arm, thus:

• for Central Roundel Apron Hatching it is the offset of the marking from the island,
• for Circulatory Nearside it is the offset of the marking from the nearside definition line,
• for Entry Nearside it is the offset of the marking from the nearside definition line at entry,
• for Exit Nearside it is the offset of the marking from the nearside definition line at exit.

Longitudinal Offset is the offset of the marking in the direction of the road or arm, thus:

• for Entry Nearside it is the offset of the start of the entry marking from a pedestrian crossing if one exists. If one does not exist it has no effect,
• for Exit Nearside it is the offset of the start of the exit marking from a pedestrian crossing if one exists. If one does not exist it has no effect.

Angular Offset is the offset of a feature, measured as an angle, thus:

• for Circulatory Lane – Spiral Full it is the offset of the start of the marking at the edge of the island or apron (if one exists).

Tangential Offset is used to make small adjustments to the alignment of the spiral exit lane markings on exit. It is the angle between the tangent to the exit lane marking where it intersects the ICD, and the end of the spiral marking. These two markings should meet tangentially and any adjustment that you make will include a transition curve to avoid any abrupt changes of direction.

You may use the Reference field for any relevant notes.

Select Break at Crosswalk if the line should not be continuous through a crossing.

Select Entry Lanes Gaps if a circulatory marking should have gaps where entry lanes cross.

Select Lane Transitions Gaps if a circulatory marking should have gaps to indicate where vehicles may change lanes.

Select Extend Central Island to mark a no-go area between the innermost circulatory lane marking and the center island.