Configures the grading model initially.

Note: This tool requires that the roundabout was created with at least one approach leg.

Designing the grading for an intersection is initially completed in two steps:

1. Configuring the grading model
2. Editing the grading model's alignments and regions

IMPORTANT!

Configuring the grading model is only available the first time a grading model is created for a roundabout. After that, selecting the grading model with the Design Grading tool will always invoke the editing modes.

Grading Model Configuration Dialog Box

Tools Section

Button	Option	Click to...
	Adjust Grading Leg Length	Lengthen or shorten the length of the grading model along a leg in the roundabout. After clicking this button, click in a leg in the grading model.
	Replace Crown Alignment	Replace a selected crown alignment with a user-drawn element.

Initial Grading Settings Section

Cross-slope Region Length

Displays the cross-slope region length value. This is the maximum length of the cross-slope regions on each leg of the roundabout's grading mode. The cross-slope region length is measured from the extents of the corner geometry to the end of the cross-slope region.

Crown Alignments Elevation

Displays the crown alignments elevation value. This is the starting elevation value for all crown alignments in the grading model.

Cut Slope

Specify the slope of the cut portions of the grading.

Fill Slope

Specify the slope of the fill portions of the grading.

Set Initial Elevations to Surface

Select this option to generate the grading model at the corresponding elevations of the target surface.

Note: The Crown Alignments Elevation value cannot be specified manually if this option is selected.

Surface Selection Section

Target Surface

Select a surface in the list or click  Select Point File to create a surface from a point file.

Select Point File

Creates a surface from an existing .XYZ format source file (e.g. point file containing points).

Note:

• All point files will import the coordinates that are specified in the file based on the units set in Program Settings -> General: Units.
• A block/cell will be created from the point file that TORUS will use as the surface.