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Design Criteria Files

Product Documentation
Intermediate

A design criteria file contains the standards tables that specify appropriate minimum design standards for alignments or profiles.

The design criteria file contains the minimum design standards for alignment and profile objects. You can customize the design criteria file to support local design standards for parameters such as transition length and minimum radius.

Design criteria files containing standards in both metric and imperial units are included with AutoCAD Civil 3D.

If your local agency standards differ from those in the supplied design criteria files, you can use the Design Criteria File Editor Dialog Box to customize the file to support your local standards.

Note

If you use a custom a design criteria file, you must save it to a shared server to which all members of your design team have access. If you send a drawing that uses a custom design criteria file, you must send the design criteria file with the drawing.

Specific design criteria files are available for road and rail applications. The Rail alignment type cannot use the road design criteria file, and the Centerline, Offset, and Curb Return alignment types cannot use the rail design criteria file.

NoteNeither design criteria file can be applied to the Miscellaneous alignment type.

Alignment Design Criteria

A design criteria file can contain the following alignment design criteria:

  • Minimum radius at a given design speed
  • Attainment method
  • Superelevation rate at a given radius
  • Minimum transition length for a given radius
    Note

    Compound spiral length is not validated against the design criteria file. You must use design checks to validate compound spiral length.

  • Automatically adding widening to dynamic offset alignments. For more information, see Adding Automatic Widening. (Road design criteria files only.)

Profile Design Criteria

A road design criteria file can contain standards tables for minimum K values at specified design speeds. Minimum K tables for the following distances are available:

  • Stopping Sight Distance
  • Passing Sight Distance
  • Headlight Sight Distance

Tutorial Exercise: Modifying a Design Criteria File


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