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The boundaries are available through the Road Surfaces dialog, located at the top of the list of surfaces for left and right side respectively.

Boundaries are used to limit the extent of the roadmodel data in the cross-sections. Typical use-cases are limiting the road design against other roadmodels, buildings, structures or design data. The boundaries will clip all roadmodel data at the defined left and right limitations of the model. It is also possible to define that the limitation is because of a bridge/tunnel which will remove the fill/cut solids within the sections.


Define a from-to interval for the boundary. When using different limitation elements the boundary description can be divided into sub-sections.

Subsections need to be defined based on at least two station values (start-end stations). Within the start-end sections there can be multiple intermediate sections if needed.
Subsections can be split with a Break. Add a break by writing any text in the chainage column.

Methods of Defining Boundaries


Select a surface from the pull down menu of the column 'Surface' and define the end station of the boundary in the next row.

  • The selected surface will be utilized through the whole subsection (from-to station).
  • The selected surface will be shown in the column 'Surface'.
  • Nothing else is required to define for this method.
  • The road cross-section will be terminated at the assigned surface.

Click the button 'New Line' in the lower right corner of the dialog box.

  • All the properties related to this method are to be defined in the dialog box 'Lines as Surface Edges' which pop up with the button 'New Line'.
  • Define the section for where to use the line as a boundary.
  • The selected line will be utilized through the whole subsection.
  • The selected line will be shown in the column 'Line'.
  • The road cross-sections will be bound to the selected line's horizontal geometry (vertical geometry of the selected line is not considered).
  • The line must be located on the lefthand side of the reference line to be able to use for the left boundary description. Same logic for the right side.

This method is an extension of the above two methods.

  • Select the boundary limitation.
    • Either a surface or a line as selected in the above methods.
    • The selected primary line will be shown either in the column 'Surface' or 'Line' depending on the method used.
  • Assign a distance from the primary line in the column 'Distance'.
    • Assign the value with a sign in meters. + (plus) means to move the limitation further away from the roadmodel centerline, - (minus) means to move the limitation closer to centreline.
  • The distance value can vary within a subsection
  • A not-defined/blank distance cell is interpreted as “Distance = 0.000”


The object column makes it possible to define that the boundary used is related to a location of a Bridge, Tunnel or Retaining Wall.

In addition to adding left/right limitation to the model, when using Bridge or Tunnel the road calculation will cut away the features for Cut and FillLayers that are inbetween the left/right boundary. This means that the solids and volumes will not be part of the result model. This will improve the Quantity reports and how a model is presented in a view (typically in an interchange with road models crossing eachother with different elevations.

How to use:

  • Add a boundary limitation on both left/right side of the model
  • Add Bridge or Tunnel info in the 'Object'-column on both sides of the model on the corresponding limitation
  • The function will handle if the from-to is not equal on both sides of the road model

The road pavements will not be affected and thicknesses for pavement needs to be adjusted in the Pavement dialogs.

Using Retaining Wall object will not give the same functionality as Bridge/Tunnel, and is just informational in the dialog.

Last modified: 2020/05/19 10:24 by vn_no_dso