Road Surfaces

One of the key elements of a road model is the road surfaces. These surfaces together form the whole road model, from the centerline and out to either side all the way to the cut or fill edges.

The road surfaces are added, formed, and edited from the dialog Road Surfaces.

Surface Types

Road surfaces are divided into different surface types with different properties and areas of use (you can find a more detailed description for each surface type here):

Each surface type group has 19 sub-surfaces on both the left- and right-hand sides.

The Dialog

The Road Surfaces dialog consists of

Surface list (left pane)

Show: The surface list can be filtered in three different ways:

All used surfaces is the default setting, showing only surfaces in use on the project.

Surface list: Surface descriptions are organized in different levels.

Each surface in the road model has an internal surface number with a precluding sign character identifying surfaces on the left side of the road (negative) and surfaces on the right side of the road (positive). The first cipher in the surface number represents the surface type, while the trailing ciphers (after the punctuation mark) represent the surface number within the type. This number is shown in the surface list as e.g. -1.01 or 6.11.

Tip: Each road surface should have a unique name. This way the surfaces will be easily recognized in other dialogs, e.g., Pavement, and Detailed Pavement.

Adding surfaces

To add surfaces to a yet not existing surface type group use one of these methods:

Note: Each surface type can have a maximum of 19 sub-surfaces on both the left- and right-hand sides. Also note the description after the surface number and name. This shows the feature type (read from the conversion file) that this surface will represent in the Quadri model.

To remove a surface right-click the surface and choose to delete it.

The details of the surface selected will be displayed in the right pane.

Surface Description (right pane)

Defining and modifying the surface description is carried out in this table. Each surface is defined with station, width, and slope, and can also include a method, line, and free surface when using Alignments as Surface Edges.

The details defined in a particular row of the table apply to this station in the reference alignment.





Used together with the New Line button.


Used together with the New Line button. Objects (alignments) can be assigned to the road model as surface edges using the button New Line.

Free Surfaces

Used together with the New Line button.


Insert - Use this button to insert a row in the right pane of the dialog box. Select a row, above which a new row is to be inserted and click the button.

Delete - Deletes the selected row from the right pane of the dialog box.

Undo - Cancel the previous action.

Advanced/Normal - This button is available only when a ditch surface is selected. Using this button, active ditch surface can be changed from Normal to Advanced and vice versa. For further details, refer to Ditch Design.

New Line/Edit Line - Objects (alignments) in the active database (Digital Terrain Model) can be assigned to the road model as surface edges using this button.

Macro - Predefined descriptions for parking bays, bus bays, acceleration lanes, and retardation lanes, etc., can be inserted using this button.

Apply - Use this button to add the changes. The resulting model will be discarded as the new changes are implemented. If the Cross-Section Viewer is active, then the changes will be shown here.

Next topic: Surface Types