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Design Summary

The intent of this document is to outline the process of designing a project using MX SS3 OpenRoads. It is only a summary and not intended to cover every situation. SS3 is very different from SS2 in that OpenRoads works with Civil Geometry Features in the DGN file not with conventional MX models and strings. There is still a need to convert Civil Geometry features to MX strings so that established final design procedures may create final drawings such as for profiles.

Much of this information is still applicable in MX SS4

back to topBeginning a Civil Design Project

Before starting work on any project, a directory must be created to store the data. NHDOT practice is to create a folder for the project under a folder for the town. In the case of a project covering multiple towns, the first one in the project name is used.

Make sure you select US_Imperial for the Default MX Project Settings. If this choice is not available, contact your CAD/D administrator. Pay Attention to the MMD you are using and only use an MMD created for SS4 projects when working in SS4!

back to topCivil DGN Files and Models

A typical Civil DGN has 3 models in it; a 2D Default model, a 3D Default-3D model and a 3D MX model. Work should be done in the Default model unless otherwise stated. MX Models and strings will only be displayed in the MX model.

The Default model has the Default-3D model attached with live nesting which has the MX model attached to it with live nesting. So you are really seeing all the information in the dgn when you look at the Default Model. Individual Windows can have a view of the 3D information even when in the Default 2D model. Use the View Group > Multi-Model Views to display.

The following seed files should be used when working in SS3 or SS4 (see below).

mx configuration file management dialog box

Next, delete the Cell Library. This needs to be deleted so the MX mapping table will find our MicroStation Cells instead of creating them from macro symbols. Deleting the cell file by clicking on the ... entry Select the cell file, Right-click on it anvb hit delete to delete it.

When complete, select OK to apply these changes.

back to topCreating the Terrain DGN

In SS3 & SS4 Design, a Terrain Model is created for the existing surface. In the future, the terrain model will be created by Plan Prep, but for now it will be created from the MX TOPO and TRIANGLES models. This is an outline of the 3 step process.

  1. Create the DGN and Terrain - Create Terrain from Triangles
  2. Creating the features from TOPO model - Importing MX Strings
  3.  Convert MX Point Strings to Cells

back to topFeature Definitions

A Linear Feature Definition controls how the feature is displayed in 2D plan, profile, section, and 3D view and how it interacts with various tasks.

Full details are included in Feature Definitions.

back to topRoad Design - Corridor - Corridor Templates

OpenRoads works within MX using the Civil Tools to perform all the roadway design steps. Drawing file names and how they are referenced is important and is documented in Create Project DGN's.

A simplified outline of alignment and corridor design steps with links to more in-depth explanations of the Tools follows:

  1. Use the Horizontal Geometry Tasks to create the alignment in the Geometry drawing.
  2. Set the Active Terrain model first then use the Vertical Geometry Tasks to Create the Profile. It is advisable to Save Settings and Save prior to starting a profile.
  3. When finished designing, save the dgn then set the profile to be active. This will attach the profile to the Horizontal Geometry and create the 3D Alignment Features.
  4. Open a Corridor dgn and use the Corridor Modeling Tasks to Create the design. First set the active element template to Corridor.
    attributes dialog box
  5. Use the Create Corridor tool and follow prompts and apply a template. More detailed documentation of Corridor Creation is available.

    • Apply/define a Template
    • Review dynamic sections
    • Create widenings, parametric constraints, point controls, and end condition exceptions
    • Create superelevations by Parametric Constraints and shoulder roll overs
    • Create side road corridors and clip the design
  6. Create and Annotate Cross Sections

back to topRoad Design - Surface Template and Linear Template

  1. Create surface geometry and features.
  2. Create Terrain model.
  3. Apply surface Template.
  4. Apply linear templates along edge lines.

back to topCross Sections

After the Corridor is designed, Cross Sections can be generated.  See Creating Cross Sections for complete details of this process.

back to topCivil Cells

Civil Cells are located in the nhdot-civil-cells.dgnlib. There are currently 6 intersection cells and more will be created.

back to topBentley Training

When using the links to the Learn Server, you need a Bentley username and password. If you do not know this information, contact your CAD/D administrator.

Learning Paths for OpenRoads - SS3 Technology Preview.

Learning Paths contains sections which will show you how to design with OpenRoads. It is suggested that you work through them in order. Select an On-Demand course and hit LAUNCH.

Additional Training topics can be searched for on this site. Find Training > MX.

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