In this exercise, you will define breaklines from existing 2D polylines that have been drawn between existing roadway edge of pavement, ditch, and railway bed points.
On the command line, enter LOA to turn all of the layers in the drawing back on.
Enter LAI, and then press ENTER twice to display the Layer(s) to isolate dialog box.
From the Layers list, select 2D_Breaklines, and then click OK to isolate the existing road 2D polylines.
On the Terrain Model Explorer, select Breaklines, and then right-click and click Proximity by Polylines.
Enter Misc_Topo for the Description, and then use a crossing box to select the existing 2D polylines.
Press ENTER to display the Terrain Breaklines dialog box, and then click No to continue.
As additional message dialog boxes are displayed, click Yes to continue and process the breakline data.
The 2D polyline breakline data is displayed in the right pane of the Terrain Model Explorer.