When you bring AutoCAD Civil 3D alignment, profile and corridor data into an InfraWorks model, InfraWorks uses the centerline alignment and profile data to define the design road, and road and coverage styles to display the centerline and the areas corresponding to the corridor link styles.
A set of default style rules maps design road alignment and profile data to a centerline style, and maps corridor link styles to road and coverage styles.
A corridor assembly in a Civil 3D drawing, showing its links.
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The same corridor data brought into InfraWorks, which uses default style rules to display the road and coverage areas.
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The predefined style rules use the expression, TAG = 'style name' to map alignment styles to design road styles and corridor links to coverage area styles.
Shown below are the 8 default Road style rules, loaded (Import All). Tab to Coverage Areas to see the 20 default coverage area style rules.
You can edit the default style rules or define new ones. See: To define style rules and About the Expression Editor.
You can create sets of customized style rules for others to use. After defining a set of rules, use Export All to store them in the model's Resources folder. Other users can then use Import All to load them. See To import style rules for displaying corridor data.