Supplemental Resources: Roadway Designer

Roadway Designer - Overview

Roadway Designer:

Templates are used to create a proposed model of the roadway. This is accomplished using the Roadway Designer. In the Roadway Designer, templates are assigned to specific stations along the mainline alignment at specific intervals, which are called template drops.

The Roadway Designer connects the points of the template drops, forming a model of the roadway, which is made into a surface model. The connected template points form longitudinal breakline features in the surface model.

Only the top points in the surface model generated by the Roadway Designer are triangulated. All subsurface points that are lower than the triangulated surface are Exclude from Triangulation points in the proposed surface. The subsurfaces will appear, if desired, in the proposed cross sections as components. Components are used to generate the subsurface line work on the GEOPAK cross sections, allowing proposed earthworks to be processed.

The Roadway Designer tool is accessed by selecting the Open Roadway Designer icon from the Corridor Modeling dialog.

Roadway Designer access

Creating a Corridor

A Corridor is a design section of roadway defined by the station limits of the mainline’s horizontal and vertical alignment. A corridor is created by using Corridor > Corridor Management.

To create a Corridor, name the Corridor, select a horizontal and vertical alignment, and optionally set the station limits of the project. A single roadway design file (.ird) can store multiple corridors for a project. The surface symbology is also specified when a corridor is created. The symbology is used to set the surface cross section and profile symbologies when an individual surface is created from the corridor.

NOTE:  The .ird file can only be opened by one user at a time.

Roadway Designer Create Corridor

To save the .ird file, or, Roadway Designer file, select File > Save.

Roadway Designer save

Template Drops

Template Drops assign previously created templates to specific stations in the corridor. The XY = 0,0 point on the template tracks on the corridor's horizontal and vertical alignment to form the proposed roadway.

To create Template Drops, select the appropriate template from the template library, the station where the template is applied, and the modeling interval. The final result is a station and template list.

Roadway Designer Template Drop

Point Controls

Template Point Controls are used to override the normal horizontal and vertical locations of template points during the modeling process. Design examples include lane widening, ramp and intersection design, superelevation, and divided highways with separate grade lines.

These overrides are accomplished by assigning template point names to alignments or surface features. The assigned template points will follow the alignments or surface features using horizontal and/or vertical controls within a specified station range.

One way to make a point in a template follow a line in plan view is to convert the plan graphic to an alignment. To achieve this, the Plan Graphics option on the Corridor Modeling dialog is used to store such plan view graphical elements in the Roadway Designer alignment file (.alg). Since Roadway Designer does not work with plan view graphics like criteria does, the elements must be stored as alignments in the Roadway Designer alignment file (.alg). The alignments can then be used by Roadway Designer for pavement transitions, widening, etc.

Roadway Designer Point Control


Whenever two or more different templates are applied to a single corridor using the Roadway Designer, Transitions between the templates occurs. For example, a template transition occurs when the roadway design changes from a two lane to a four lane roadway. Transitioning can be as simple as the width of the travel lane increasing. More complicated designs often call for multiple templates that vary throughout the corridor. Regardless of the transition complexity, Transitions must be identified and verified to obtain desirable results. How template points are connected between two consecutive templates greatly influences the design results.

Template Transitions occur between templates that have different names in the Template Drops dialog. To hold a template cross section through a station range, assign the template at its starting station and assign the same template again at the station where it starts its transition.

When adding more than one template using the Template Drops command, template transition areas are displayed in the Roadway Designer’s Plan View window. They are shown as colored rectangles between the template drops. Template drops are shown as transverse brown colored lines.

The color of the Transition areas indicates the condition of the transition with respect to how the points are connected. Template points of two different templates are connected automatically if they have the same point names. This is the most desirable condition. If the points names are different or the number of points between the two templates are not the same, then the point connection must be manually specified for each transition. Regardless of the condition, each transition area must be verified prior to processing. Template point constraints greatly affect the transitioning results.

Roadway Designer Transition area

To review the Transition areas, double click on the transition area in the Plan View window. This displays the Edit Transition dialog, which shows the point connections between the two templates.

Template points which have similar names are connected with line segments. Template points that are not connected, either because they don’t have similar names or the number of templates points differ, display as bold colored points. To connect an unconnected point, first click on any bold point and then click on the connection point. A line segment is drawn between the points. The feature style and name used for the line is determined by the first point selected when connecting points.

A single point can have more than one connection. To remove a connection line, right click on the line and select Delete. The 3D display can be manipulated using the view controls located at the bottom of the view. To move the template in the view, right click on any template point and select Move Template. Moving the templates makes it easier to connect more complicated templates. End condition components are not shown or edited during this process.

After the points are connected using the Edit Transition dialog, the transitioning is reviewed and edited using the Edit Transition Midpoint dialog. This dialog displays a cross section view of the two templates as they transition. The dialog starts by displaying the midpoint between the two templates. Located on the bottom of the window is a slider bar which is used to view different locations on the transition.

If the template points are constrained in a manner that prohibits the template transition, they can be edited in this dialog. Just like in the Create Template dialog, right clicking on any point brings up the editing options. You can also double click on any point to bring up the Point Properties dialog.

End Condition Exceptions

An End Condition Exception is used to override end conditions along a range of corridor stations. Select Corridor > End Condition Exceptions to activate the command. This brings up the End Condition Exceptions dialog. Enter the station range and specify which side of the road is being overridden. Click Edit to edit the end condition. This brings up a dialog box similar to the Create Template dialog. However, the dialog shows only the end conditions on the specified override side. All other non end condition components are shown as dashed lines. Override the end condition using the familiar Create Template tools.

Sometimes the end conditions are not desired in the design, for example, when the corridor passes through an intersection or crosses a bridge. To eliminate end conditions for a range of stations, create an end condition exception and select the Backbone Only option.

End condition exceptions are displayed in the Plan View window as a cyan colored shape. You can double click the shape to access the End Condition Exceptions dialog.

Roadway Designer End Condition Exception area

Create Surface

The Create Surface dialog is used to create a surface or surfaces from the roadway design. You can create a unified or merged surface out of all the corridors in the design, or create a separate surface for each corridor.

When you create a surface, the software automatically creates an .dtm file aand at the same time creates a .tin file. The .tin file includes only surface data and is created in the GEOPAK working directory. The .tin file is given the same name as the surface. For example, if you name the new surface Final, the software will create two files: Final.dtm and Final.tin.

Roadway Designer Create Surface dialog


The Options dialog sets up additional processing and display options for the roadway design session.

Roadway Designer Options dialog

The dialog is divided up into three main areas:

 There are also two other selections:

Include Critical Sections allows you to turn on or off the processing at horizontal and vertical cardinal and event points.

Horizontal Cardinal Points
When checked on, horizontal cardinal points are included in the roadway design.

Vertical Cardinal Points
When checked on, vertical cardinal points are included in the roadway design.

Horizontal Event Points
When checked on, horizontal event points are included in the roadway design.

Vertical Event Points
When checked on, vertical event points are included in the roadway design.

External Control Points
When checked on, external control points are included in the roadway design. External control points are points which are controlled by other alignments, features, or parametric constraint entries. When point controls are assigned and use these types of parents, the vertices of the controlling alignments/features are not processed stations unless this option is checked on. For example, a right of way alignment for which you want to have a processed station at each random right of way break that may not be at an even processing station.

Display Options allow you to turn on or off various displays in the roadway design.

Reference Graphics
When checked, reference graphics are displayed in the plan View.

Transition Graphics
When checked, transition graphics are displayed in the plan View.  When this toggle is off, double-click functions in plan view transitions are not available.

Triangulated Surface
When checked, the triangulated surface displays as a heavy red dashed line in the cross section view.

Cut and Fill graphics
When checked, cut and fill graphics display in the cross section view.

Cut and Fill Values
When checked, cut and fill values display in the cross section view.

Net Volume
When checked, net volumes display in the cross section view.

Null Points
When checked, null points display in the cross section view.

Curve Set ID
When checked, curve set IDs display in the plan view.

Cardinal Points
When checked, the active corridor alignment cardinal points as white plus symbols in the plan and profile views.  When the points are displayed, tooltip information is also available for the cardinal points.

Cross Section Tracking
When checked, the offset, elevation, and design surface slope display in the cross section view.  Slope is determined by projecting the mouse location to the design surface. If this point does not fall on the design surface, slope is not displayed.

Superelevation Display allows you to turn on or off results in the superelevation display.

Key Station Lines
When checked, vertical key station lines in superelevation view.

Station Results Reporting Options allow you to turn on or off station results reporting.

End Condition Failures
Indicates, when checked, that end condition failures at each station are reported in the Report dialog when Process All or Process Visible Range is selected.

Display Rule Values
Indicates, when checked, that display rule values at each station are reported in the Report dialog when Process All or Process Visible Range is selected.

Point Control Usage
Indicates, when checked, that point controls used at each station are reported in the Report dialog when Process All or Process Visible Range is selected.

Component Information
Indicates, when checked, that component display status at each station is reported in the Report dialog when Process All or Process Visible Range is selected.

Point Information
Indicates, when checked, that point display status and coordinates are reported in the Report dialog when Process All or Process Visible Range is selected.

Process Aliases Automatically specifies, when checked, that target alias corridors are automatically processed first.

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