Use this dialog box to configure a dynamic offset alignment to automatically widen around horizontal curvatures of the parent alignment.
When you use this feature, there are two ways that you can create the automatic widening; either by specifying parameters through a design criteria file (associated with the parent alignment), or by specifying parameters manually (by entering values for the Increase in Width and the Transition Length fields on this dialog box).
This feature can only be applied to dynamic offset alignments.
- Along Entire Alignment
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Specifies to apply the automatic widening along the entire length of the alignment.
- At Curves Without Widening
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Specifies to apply the automatic widening only at curves where there is currently no widening already.
- At Selected Curves
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Specifies to apply the automatic widening at the curves that are selected using the Select Curves Along Parent Alignment button.
Specify Widening Using Criteria
When this option is selected, the automatic widening on curves is controlled by the property values that are specified in the property table on this dialog box. A valid design criteria file must be available for selection to use this option. The design criteria file that is specified must be associated with the parent alignment for the offset alignment. The default property values that are displayed in the table below are specified in the design criteria file, and from command settings. However, you can edit these values on this dialog box. When you edit these values on this dialog box, it does not affect the property definitions in the criteria file, or in command settings. See the descriptions of the properties below to determine which ones are specified in the criteria file, and which ones are specified in command settings.
The default value for this option is defined in the command settings (Automatic Widening Around Curves property group, Widening By property).
- Parent Alignment Design Criteria File
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Displays the name and location of the design criteria file that is associated with the parent alignment for this offset alignment.
- Widening Method
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The default value for this property is defined in the Widening Methods section of the specified design criteria file.
- Widening To Apply On
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This property specifies how the manual widening is applied. The choices are: a.) Inside Only: Applies the automatic widening to just the insides of curves, not the outsides of the specified curves. b.) Outside Only: Applies the automatic widening to just the outsides of curves, not the insides of the specified curves. c.)Both Sides: Applies the automatic widening to both the inside and outside of the specified curves.
When specifying widening manually, all other controls in the property table are disabled, except for this one.
The default value for this property is defined in the command settings (Automatic Widening Around Curves property group).
- Minimum Radius Table
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The default value for this property is defined in the Widening Methods section of the specified design criteria file.
- Transition Length Table
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The default value for this property is defined in the Widening Methods section of the specified design criteria file.
- Attainment Method
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The default value for this property is defined in the Widening Methods section of the specified design criteria file.
- % on Spiral for Spiral-Curve
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The default value for this property is defined in the command settings (Superelevation Options property group).
- % on Tangent for Tangent-Curve
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The default value for this property is defined in the command settings (Superelevation Options property group).
- Normal Lane Width
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Specifies the lane width or click
and select a distance in the drawing area. The default value for this property is defined in the command settings (Superelevation Options property group). - Number of Lanes - Left
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Specifies the number of lanes on the left side of the roadway. The default value for this property is defined in the command settings (Superelevation Options property group).
- Number of Lanes - Right
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Specifies the number of lanes on the right side of the roadway. The default value for this property is defined in the command settings (Superelevation Options property group).
- Wheelbase Length
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Specifies a numeric value for the wheelbase length that is used in the formula for widening around curves. This value is used only when the widening method is through design standards. It is not used when the widening is specified manually.
The default value for this property is defined in the command settings (Automatic Widening Around Curves property group).
Specify Widening Manually
When this option is selected, the automatic widening is controlled by the values entered for the following fields. The default value for this option is defined in the command settings (Automatic Widening Around Curves property group, Widening By property).
- Increase In Width
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Specifies the width (dW) parameter that defines the increase in width of the left or right roadway lane around curves when automatic widening is applied. The default value for this property is defined in the command settings for the Create Offset Alignment command (Automatic Widening Around Curves property group, Manual Widening Width property).
- Transition Length
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Specifies the length of the transition to which the automatic widening is applied. The default value for this property is defined in the command settings for the Create Offset Alignment command (Automatic Widening Around Curves property group, Manual Widening Transition Length property).
- Widening To Apply On
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This property specifies how the manual widening is applied. The choices are: a.) Inside Only: Applies the automatic widening to just the insides of curves, not the outsides of the specified curves. b.) Outside Only: Applies the automatic widening to just the outsides of curves, not the insides of the specified curves. c.)Both Sides: Applies the automatic widening to both the inside and outside of the specified curves.
When specifying widening manually, all other controls in the property table are disabled, except for this one.
The default value for this property is defined in the command settings (Automatic Widening Around Curves property group).