Kerb Design Controls

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Introduction

By default, Civil Site Design creates kerb returns that automatically redesign themselves to achieve the following:

The software automatically generates one vertical curve (half the length of the kerb return alignment) when the incoming and outgoing tangents intersect in the middle half of the return, or two vertical curves (each half the length of the kerb return alignment) when the incoming and outgoing tangents do not intersect. By default, the vertical curves through the kerb return are set to automatically redesign themselves to continuously map the main and side road levels.

Designers can turn this automatic redesign off to enable manual editing of the kerb return profiles using this command.

Note: This option of changing the redesign controls is also available at the time of editing the kerb return using the Create/Edit Kerb Return command as well as in the Vertical Grading Editor  window.

Details

Examples of the two 'redesign' options are shown:

Incoming and Outgoing Tangents Intersect in the Middle Half of the Kerb Return

Incoming and Outgoing Tangents Do Not Intersect

Editing the kerb return IP's in the Vertical Grading Editor will automatically change the kerb setting to Keep Internal Design, so changes made by the user are maintained.

To change the redesign of the kerb return profiles start this command and the following form will be displayed:

The table lists all the Kerb Returns, Cul-de-sacs and Knuckles that have been created by the software.

Against the Design Flag for each of these objects, the profile design options can be set to either:
 
Automatic Re-Design The software continuously recalculates the profile to match the incoming and outgoing grades at the start and end of the kerb return and creates vertical curve/s to smoothly transition through the return. The Designer CANNOT edit the kerb return levels.
Keep Internal Design This enables the Designer to manually edit the profile between the IPs created at the start of the kerb return (matching the incoming Road level) and at the end of the kerb return (matching the outgoing Road level).
Keep Internal Design and Match Grades This enables the Designer to adjust the internal levels. The software will attempt to maintain the incoming and outgoing grades that have been manually set by the designer.  The IPs at the start and end of the kerb return automatically and continuously match the edge of the Main Road and Side Road.
Pick Alignment Click on this to pick the alignment from the drawing - it will be highlighted in the list.
Zoom Alignment Extents Zooms to the highlighted alignment
Zoom/Pan Click to zoom and pan in the drawing.  Left click to return to the list.
OK Apply the kerb design changes.
Cancel Exit without applying kerb design changes.

Changing the redesign options increases the designer's control to independently grade the kerb return using the Vertical Grading Editor.

Note: While using the Vertical Grading Editor, if the Designer is changing the main and side road levels and the adjusted levels cannot maintain the incoming or outgoing grades set by the Designer, the following message will be displayed: