Creating a road is a multi-step procedure. The centerline of the road is defined with a polyline, and then stakes are added. The elevation of the stakes, which are initially set to the surface of the site model, can be modified before the road is created. Finally, the site model is updated and modified by the road object.
A Roadway (NURBS) object offers a simpler, but less exacting, way of inserting a road on a DTM, and is available in both VectorWorks Architect and Landmark. See Creating NURBS Roadways for more information.
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1.
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If desired, create a new layer for the road by selecting Tools > Organization. The layer scale should be the same as the site model layer scale. Set the site model layer to visible, and select View > Layer Options > Show/Snap Others.
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Using the Polyline tool, create a polyline that represents the road shape.
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Select the polyline, and then select Landmark > Roads > Station on Polyline. The Place Station Points Along Polyline dialog box opens. This command places stations at 100’ (or 30.48 m) intervals. In addition, partial station points can be placed at smaller intervals. Enter the interval between partial stations and select a labeling option for the curve information.
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Creates a Station Worksheet with the curve data; the worksheet number corresponds to the polyline number
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Click OK to create the station points along the polyline. If this is the first time a stake has been placed in the file, the Object Properties dialog box opens. Accept the default values and click OK. Stake properties are described in Determining the Elevation of a Point on the Site Model.
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In Placing Station Points Along the Road Polyline, the stake elevations were set according to the site model; in real situations, a road is often set to a grade other than natural grade. The Align Stakes Vertically command sets the elevation of the stakes to a specific plane.
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Set the elevation of only one of the terminal stakes (one of the stakes at the ends of the segment to align) by selecting the stake and entering its elevation in the Object Info palette. If a DTM was present when the Station on Polyline command was executed, the elevation of the stake is set to the proposed DTM elevation for reference.
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In the segment to align, press the Shift key to select both the first and last stake (the stakes at either end of the desired elevation alignment), and then select Landmark > Roads > Align Stakes Vertically.
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This procedure creates the road by automatically making an individual road object between each stake. The road follows the centerline polyline, and is set to the elevations specified by the stakes.
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Select the center polyline or any of the station points, and select Landmark > Roads > Create Road from Stakes.
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Click OK. The polyline and stakes are used to create a road section between adjacent stakes. If this is the first time a road has been created in the file during this session, the Object Properties dialog box opens for creating straight and curved roads. Accept the default values and click OK in both dialog boxes.
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Once created, the straight and curved sections of the road need to become site modifiers by selecting the road sections and then selecting Use Site Modifiers in the Object Info palette.
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Use the Custom Selection command to select the straight and curved road sections; see Creating Custom Selection Scripts.
The fence offset can be set manually, or fences can be turned off and created separately using the Create Fence from Pad command (see Creating a Control Fence Automatically). When site modifiers are used, each road section contains a pad (see Creating a Pad and Creating a Control Fence).
Stakes should not be moved (except in elevation) when using the Create Road from Stakes command. If an additional stake is required, add a vertex point to the polyline, provide an elevation value, and run the Create Road from Stakes command again.
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The proposed DTM requires updating. Select the site model and click Update from the Object Info palette.
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If the road was created on a different layer from the site model, click Site Model Settings from the Object Info palette and ensure that Use Site Modifiers on All Layers is selected.
The proposed site model is updated. If Use Site Modifiers was selected for the road sections, the contour lines are adjusted to rise or fall to meet the level of the road.
