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Create Side Road Horizontal and Vertical Geometry

Documentation for Side Road/Driveway Design is composed of four documents, this is Part 1.

Side Roads and drive ways are designed after the Main line corridor has been completed. The horizontal and vertical geometries will match into the Main line.

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

Horizontal Geometry

All alignments should be created in the Geometry.dgn. The Corridor dgns should contain the corridors, superelevation, civil cells and drives for each roadway.

Open the 12345 Geometry.dgn file and change the active model to Default. Use the Horizontal Geometry Tasks to Create each Side Road and Driveway Alignment in the Geometry dgn. Reference the Main line corridor's Default model to this drawing so the corridor's features can be referenced when creating additional profiles.

Side road alignments should normally start perpendicular to the main line. To accomplish this use Element design rather than Complex by PI. Use the Feature Definition Toggle bar to select the Alignments Elements feature and toggle on the use Active Feature button. Open the Horizontal Geometry Tasks.

  1. horizontal geometry dialog boxThe first task to use is the Line Between Points, use a perpendicular snap on the Main line geometry. Notice how the line remains perpendicular as you move to place the second point. Place as appropriate.
  2. Next place other Line Between Points to define additional tangents.
  3. The Simple Arc command will place an arc between and 2 tangents. Trim Both when placing the arcs.
  4. Change your feature to Alignment if designing a side road or to Alignment Drive if creating a drive way. Use the Complex By elements command to join the geometry together. Name the Geometry as appropriate.
  5. After creating the alignment set it's Priority to 500. It is advisable to Save Settings and Save prior to starting a profile.

Vertical Geometry

  1. vertical geometry dialog boxUse element selector to select your horizontal alignment and then hover over it. Select the create profile icon, and then open and hit in a new view. The window should change to a profile view showing the old ground profile in green. Set your views so you can see both the Default and the Profile model view.
  2. Use the Profile Intersection Point Task profile intersection point button, hit on the side road alignment and then hit on the main line alignment and the main line TW to add point symbols to your profile.
  3. Use the Profile Line Between Points task profile line between points button with Origin snap to place the first Tangent on the 2 point symbols.
  4. Place additional tangents using the same command.
  5. The Parabola between Elements parabola between elements button is used to place arcs between the tangents. Trim Both.
  6. The Profile Complex by Elements profile complex by elements button task links the profile pieces together. Name the profile.
  7. When finished designing, save the dgn then Set Active Profile set active profile button Using Element Selector and hovering over it and picking Set by selecting the Set Active Profile command. This will attach the profile to the Horizontal Geometry and create the 3D Alignment Feature.

If you want stations on your alignment pdf file, it needs to be transferred to MX then Drawn in the MX model followed by using the drawing annotation tool to annotate it.

Portable Document Format Symbol Portable Document Format (.pdf). Visit for a list of free .pdf readers for a variety of operating systems.

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