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Place and Modify Intersection Civil Cells

Documentation for Side Road/Driveway Design is composed of four documents, this is Part 2.

Side Roads and drive ways are designed after the Main line corridor has been completed. This step describes the process of placing the intersection civil cell after the side road alignment has been designed.

Note that references to "12345" in file names refer to the project's five digit Project Number.

Intersection Civil Cells - Placement

Now that the Side Road Geometry is designed a civil cell can be placed for the intersection. Civil cells have been created for drives, curbed and uncurbed intersections, as well as combinations of these.

  1. Create/Open the Default-3D model of 12345-Cor-Side Road.dgn. Attach the Default-3D model of 12345-Terrain.dgn as a reference file.
  2. Open the Default model and attach the Default models of 12345 Geometry.dgn and 12345 Cor-MainLine.dgn as reference files.
  3. context sensitive buttonUse Fit View and Select the Terrain. When you hover the mouse over the terrain, this context sensitive menu should appear. Select the middle tool, Set as Active Terrain Model.
  4. Use the Place Civil Cell place civil cell buttonon the Civil Cells task menu. Hit on the ... to browse and select the cell you want. Click OK.
  5. You will be prompted to select the reference elements to place the cell on. Normally, you would select the Approach CL first, then hit on the Side Road Geometry.
  6. Follow the next prompt to select the thru road TW. Note that these selections could be reversed.
  7. There are no secondary references so Reset. Do not use clipping if asked - Reset.
  8. If the cell outline is in the correct location accept it. If not, you can hover over each reference until an arrow is seen and click it to reverse the placement. Accept the the cell when it is placed correctly.
  9. Save Settings and Save.

Civil Cells - Manipulation

project explorer dialog boxCivil Cells are created from features, terrains, surface templates and linear templates and can be modified in many ways.

Using Element Selector, select the cell's Travel Way arc - curb return (may need to reset to cycle through the selections). Element manipulators should become active at the arcs end points with the radius displayed. Click on the radius value to change it and type in the desired value. The cell should update in both plan and 3D to show the revised value.

Click on the Travel Way's tangent. This should make the offset manipulator active. Click on the Offset value to change it. Again the cell will update after making a change.

The linear templates that define the shoulders and side slopes have parametric constraints assigned to them. These can be modified by using the Corridor Objects tool and hitting on one of the template drops.

An alternate method is to use Project Explorer - Civil Models tab. Expand the DGN's entry Civil Cells > Dependent Elements and highlight each Linear Template entry. Each Linear template will be highlighted on the screen as you select it so you can determine which one you are modifying. Right click on the Template you want to modify and select the tool you want to use...

When using Parametric Constraints to modify depths of material you will need to modify all 4 linear templates as well as the surface template.

New Hampshire Department of Transportation
PO Box 483  |  7 Hazen Drive  |  
Concord, NH  |  03302-0483
Tel: 603.271.3734  |  Fax: 603.271.3914