Intersection - Left Curve Details Dialog

The edge of the intersection can be defined in two ways:

Enter Curves & Tapers - Specify the edge details of the intersection. Data requirements are the same for both left and right curves.
Extract from CAD Entities - You can also use existing drawing lines and arcs to define the edges by indicating them.

You can specify just a centre radius, or a centre radius with either a curve or taper lead in and lead out.

Option	Description
Curve	Select this checkbox to specify a transition curve as the lead-in to the intersection curve. The schematic layout is updated to show the radius and offset positions.
Taper	Select this checkbox to specify a taper as the lead-in to the intersection curve. The schematic layout is updated to show the taper and offset positions.
Radius	Enter the radius of the lead in curve. Only available if the Lead in Curve checkbox has been selected.
Taper	Enter the taper ratio as 1:x. Only available if the Lead in Taper checkbox has been selected.
Offset	Enter the distance from the point of edge intersection where the specified curve or taper should begin.
Grade	The grade of the road at this location, with the convention that at every point, facing into the intersection, negative grade is down and positive grade is up.

Option

Description

Radius

Enter the radius of the central arc of the intersection edge.

Option	Description
Curve	Select this checkbox to specify a transition curve as the lead-out to the intersection curve. The schematic layout is updated to show the radius and offset positions.
Taper	Select this checkbox to specify a taper as the lead-out to the intersection curve The schematic layout is updated to show the taper and offset positions.
Radius	Enter the radius of the lead out curve. Only available if the Curve checkbox has been selected.
Taper	Enter the taper ratio as 1:x. Only available if the Taper checkbox has been selected.
Offset	Enter the distance from the point of edge intersection where the specified feature should end.
Grade	The grade of the road at this location, with the convention that at every point, facing into the intersection, negative grade is down and positive grade is up.

Option	Description
Vertical grading	Set this option to control the vertical smoothing of bell-mouths. It can be set to one of the following: S-Curve - This is the default setting and will apply an s-curve smoothing. Linear - Select this option to apply a linear smoothing between the start and the end of the bell-mouth. From CAD Entities - This option is only available when Extract from CAD Entities is selected, and will use the heights from the CAD entities.
Apply Kerb	Select this checkbox to apply a kerb on this edge of the intersection.
Select Kerb button	Click to display the Kerb Selector and specify a kerb type.

Option	Description
Divider Island	If this checkbox is selected on either left or right side, the Centre Island Page will be disabled.
Island Type	Select the island type from the list. There are two types: Enter Radii and Widths - Specify the radii and widths in the Island Settings. Extract from CAD Entities - Indicate polylines on a drawing.
Apply Kerb	Select this checkbox to apply a kerb on this island.
Select Kerb	Click to display the Kerb Selector and specify a kerb type.

Click Indicate and the main drawing will be displayed. You are prompted to indicate the polylines that define the left or right intersection curve:

Extracting 'Left Bell Mouth' from CAD: Select Entity