Auto Kerb Returns

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Introduction

This command undertakes the following tasks automatically:

• Scans the drawing for all intersection Main and Side Roads (defined from alignments with prefix r- in the description and created using the Create/Edit Roads or Auto Create Roads commands)
• Locates the edge of each road (by reading the Label from the road cross sections assigned as the connection point in the Active Drawing Settings form)
• Creates alignments of a specified radius to match to the edge of the Main and Side Roads and maintain tangency relative to the Road centerline alignment, using Civil 3D styles set by the designer
• Automatically generates a Kerb Return road object. The Design profile matches the incoming and outgoing levels and grades and includes parabolic vertical curve/s through the kerb return to form a smooth profile.

The designer can control the default radius assigned to the kerbs at the time of running the command and also from the Active Drawing Settings.  Radius can be set at each interesection and return by using the Intersection Manager.

This command assumes that the Roads have been created (not necessarily the final designed profile).

After the kerb returns have been created users can:

• Use the Intersection Manager to edit and manage each intersection and kerb returns
• Edit the start/end of the kerb returns by changing the profile of the Main and/or Side roads via the Create/Edit Roads command
• Change the automatic redesign options for the kerb return/s by editing the  Kerb Design Controls
• Change the radius of any kerb return using the Create/Edit Kerb Return command

Details

Upon selecting the command the following form is displayed:

Default Radius	Type in the required default radius to be applied to all kerb returns that have not already been created.
[List]	Lists the total intersections detected as well as the total kerb return count.
Intersection Manager	Opens the Intersection Manager to review all intersections before creation.
Create Returns	Creates all kerb returns at all Road intersections

The command is fully automated - the software includes it's own algorithm for locating the connection points on the main and side road corridors at the edge of each road, using the road centerline for directions start and end. 

Note: Given the iterative nature of the command, designers must provide Road lengths in everydirection from the intersection point to be AT LEAST two sampled sections beyond the extents of the kerb return start/end, to provide the software with a reasonable starting point to iterate from.

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After Running the Command:

Alignments are created to connect the edge of the Main and Side Roads at every quadrant. The radius of each return, and whether to include kerb returns at intersections, can be set in the Intersection Manager prior to creation. In the example shown the thick red lines represent the kerb return alignments created by the software. Use the Create/Edit Kerb Return command to change the radius or kerb alignment design if required. The software will not accept manual edits to the kerb return alignment, except where the kerb return is defined by an alignment.