Expand an arm and click Approach in the left hand pane. The Approach page is displayed.
The Central Gap Width is the distance between the offside definition lines of the approaching lanes and the departing lanes.
The Centerline Offset is the distance from the projected arm alignment tangent at the ICD and the center of the island. The offset is positive if the tangent passes the center of the island on the opposite side to the entry road. Thus the larger the offset, the larger the entry deflection and vice versa. This value can only be grip-edited and is displayed in this dialog in a read-only field.
Select the number of Approaching Lanes and Departing Lanes from the drop down list.
The Approaching Lane Width and Departing Lane Width are measured between definition lines. On a road with no center gap, the offside definition line is the centerline.
The Crown Line Blend Offset is the point at which the entry and exit crown lines merge with the arm centerline and is measured along the alignment from the intersection with the ICD.
The entry and exit Crown Line Entry Offset is the lateral offset of the crown lines at entry (or exit) measured from the nearside kerb as a percentage of the width.
In all cases the Max and Min values represent the limiting values from the adopted design standard.