In the case of a model train and its surrounding terrain, scale is important because the model visually represents an accurate depiction of what a real-life train and its surroundings would look like. If you change a parameter value for a subassembly on one side of the assembly baseline, the change will not be applied to the opposite side.If you’ve ever seen a model of a small electronic train chugging along a little metal track lined with cotton-ball bushes and a painted foam mountain, you’ve seen how important scale is.

The parameters of the mirrored subassemblies are not dynamically linked. All the subassembly parameters, except for the Side parameter, are retained.

The Mirror command creates a mirror image of the selected subassemblies. The subassemblies are displayed on the left side of the assembly marker.

Click the marker point on the assembly baseline.

In the drawing, select the four subassemblies you added.

Mirror the subassemblies to the left of the baseline This action ends the subassembly placement command.

In the drawing, click the marker point at the outside edge of the sidewalk subassembly.

In the Tool Palettes window, on the Basic tab, click BasicSideSlopeCutDitch.

In the drawing, click the marker point at the top, back of the curb.

In the Tool Palettes window, on the Basic tab, click Basic Sidewalk.

Select the grip, and then click the correct marker point. A blue grip is displayed when the subassembly is selected. Press Esc to exit subassembly placement mode. If you attach the subassembly to the wrong marker, you can move it to the correct location.

In the drawing, click the marker point at the top-right edge of the travel lane.

In the Tool Palettes window, on the Curbs tab, click UrbanCurbGutterGeneral.

The right lane subassembly is now attached to the assembly baseline.

In the drawing, click the marker point on the assembly baseline.

In the Properties palette, under ADVANCED, specify the following parameters:.In the tool palette, right-click the Tool Palettes control bar.If the Tool Palette containing the subassemblies is not visible, click Home tab > Palettes panel > Tool Palettes.The viewport zooms to the assembly baseline, which looks like this: When the ‘Specify assembly baseline location’ prompt is displayed on the command line, click in the rectangle under the profile views.In the Create Assembly dialog box, for name, enter Primary Road Full Section.Click Home tab > Create Design panel > Assembly drop-down > Create Assembly.Open Assembly-1a.dwg, which is located in the tutorials drawings folder.The corridor assembly you build will be used to create a corridor model in the Creating a Basic Corridor tutorial. In this exercise, you will use some of the subassemblies that are shipped with Autodesk Civil 3D to create an assembly for a basic crowned roadway with travel lanes, curbs, gutters, sidewalks, and slopes to an existing surface.

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