Roadway Designer Manual: 7 - Overlay Tools Workflow

Workflow: Overlay Tools

Prerequisites

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Cross Slope Optimization

The Cross Slope Optimization Tool performs best if existing edges of pavement alignments have been previously imported. This can be easily accomplished using the Import Graphics tool in Corridor Modeler and identifying the graphical edges of pavement. These are used by the Cross Slope Optimization tool as offset references to pick an edge of pavement elevation off of the existing ground surface.

In addition to the existing edges of pavement alignments the superelevation input file should have already been imported so as to create Control Lines for both the left and right proposed cross slopes.

  1. Access Roadway Designer from the Corridor Modeling dialog.

    Location of Roadway Designer on Corridor Modeling dialog

    Figure 24

  2. Create a corridor using a centerline alignment and an existing centerline profile.

    Manage Corridors dialog

    Figure 25

  3. Create a Template Drop using one of the predefined Overlay and Milling Templates.

    Template Drops dialog

    Figure 26

    ImportantUsing a small interval will produce more desirable results than using a large interval.  A smaller interval, 5’ or 10’, is also dependent on survey covering the area.

  4. Verify that the Active Surface is set to the existing ground.

     Active Surface highlighted in Roadway Designer dialog

    Figure 27

  5. Change the Display Mode to Overlay by clicking the Overlay radio button in the lower right of the main dialog.

    Display Mode highlighted in Roadway Designer dialog

    Figure 28

  6. Select the Cross Slope Optimization tool from the Overlay Tools pulldown.

    Overlay Tools pulldown

    Figure 29

  7. Fill out the Existing Ground Cross Slope Definition portion of the dialog. This will consist of setting the Existing Type to Alignment; Identifying the Pivot Alignment as the Proposed Centerline Alignment; and setting the Superelevated Alignment to either the left or right existing edge of pavement alignment.

    Existing Ground Definition highlighted in Cross Slope Optimization dialog

    Figure 30

  8. Next, define the Design Cross Slope Definition portion of the dialog by setting the Design Type to Control Line and setting the Control Line to the either the left or the right control line created from the superelevation.

    ImportantRefer to the Roadway Designer Workflow for Importing Superelevation from INP file.

    Design Cross Slope Definition highlighted in Cross Slope Optimization dialog

    Figure 31

  9. Define the Optimization Parameters by setting a Slope Tolerance to 2.00% and providing a Maximum Delta G of 0.5

    Optimization Parameters highlighted in Cross Slope Optimization dialog

    Figure 32

  10. Click the Calculate Correction button in the center of the dialog.
  11. Review the Results portion of the dialog by stepping through the calculation or selecting the Largest button below the view which will automatically navigate the station with the largest correction.

    Results highlighted in Cross Slope Optimization dialog

    Figure 33

  12. Provide a new Section Name and a Control Line Name to be stored and click the Create button.

    Control Line highlighted in Cross Slope Optimization dialog

    Figure 34

  13. Repeat this process for the opposite side of the road. This process will only correct one side at a time and will need to be executed twice to compute both sides of a roadway.
  14. Close the dialog.

ImportantThe new Point Controls can be reviewed in the Point Control dialog.

Vertical Adjustments

The Vertical Adjustment Tool facilitates vertical grade adjustments based on many different scenarios for milling and overlay settings. This section will review the available options.

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Minimum Milling
  1. Access Roadway Designer from the Corridor Modeling dialog.

    Location of Roadway Designer on Corridor Modeler dialog

    Figure 35

  2. Create a corridor using a centerline alignment and an existing centerline profile.

    Manage Corridor dialog

    Figure 36

  3. Create a Template Drop using one of the predefined Overlay and Milling Templates.

    Template Drops dialog

    Figure 37

    ImportantUsing a small interval will produce more desirable results than using a large interval.

  4. Verify that the Active Surface is set to the existing ground.

    Roadway Designer dialog with Active Surface highlighted

    Figure 38

  5. Change the Display Mode to Overlay by clicking the Overlay radio button in the lower right of the main dialog.

    Roadway Designer dialog with Display Mode highlighted

    Figure 39

  6. Select the Vertical Adjustment Settings tool from the Overlay Tools pulldown.

    Overlay Tools pulldown

    Figure 40

  7. Provide settings similar to the ones in the dialog below.

    Vertical Overlay Adjustment Settings dialog

    Figure 41

  8. By using Use Minimum Milling option, all other options will be de-selected.
  9. The Template Range points are the extent of the proposed template to use for comparison.
  10. The Existing Ground Range sets alignments representing the existing edges of pavement.
  11. The Solution Option determines which points to actually examine to determine the minimum milling.
  12. Click OK on the dialog.
  13. Examine the results by stepping through the cross sections and reviewing in the Cross Section view.
Video
Minimum Overlay
  1. Access Roadway Designer from the Corridor Modeling dialog.

    Location of Roadway Designer on Corridor Modeler dialog

    Figure 42

  2. Create a corridor using a centerline alignment and an existing centerline profile.

    Manage Corridor dialog

    Figure 43

  3. Create a Template Drop using one of the predefined Overlay and Milling Templates.

    Template Drops dialog

    Figure 44

    ImportantUsing a small interval will produce more desirable results than using a large interval.

  4. Verify that the Active Surface is set to the existing ground

    Roadway Designer dialog with Active Surface highlighted

    Figure 45

  5. Change the Display Mode to Overlay by clicking the Overlay radio button in the lower right of the main dialog.

    Roadway Designer dialog with Display Mode highlighted

    Figure 46

  6. Select the Vertical Adjustment Settings tool from the Overlay Tools pulldown.

    Overlay Tools pulldown

    Figure 47

  7. Provide settings similar to the ones in the dialog below.

    Vertical Overlay Adjustment Settings dialog

    Figure 48

  8. The Template Range points are the extent of the proposed template to use for comparison.
  9. The Existing Ground Range are alignments representing the existing edges of pavement.
  10. The Solution Option determines which points to actually examine to determine the minimum milling.
  11. Click OK on the dialog.
  12. Examine the results by stepping through the cross sections and reviewing in the Cross Section view.
  13. Keeping the other settings the same key-in 0.2 for the Backbone thickness
  14. Examine the results by stepping through the cross sections and reviewing in the Cross Section view.
  15. Change the Minimum Overlay to 0.2
  16. Examine the results by stepping through the cross sections and reviewing in the Cross Section view.
  17. Close the dialog.
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Minimum Milling with Maximum Milling
  1. Access Roadway Designer from the Corridor Modeling dialog.

    Location of Roadway Designer on Corridor Modeler dialog

    Figure 49

  2. Create a corridor using a centerline alignment and an existing centerline profile.

    Manage Corridor dialog

    Figure 50

  3. Create a Template Drop using one of the predefined Overlay and Milling Templates.

    Template Drops dialog

    Figure 51

    ImportantUsing a small interval will produce more desirable results than using a large interval.

  4. Verify that the Active Surface is set to the existing ground.

    Roadway Designer dialog with Active Surface highlighted

    Figure 52

  5. Change the Display Mode to Overlay by clicking the Overlay radio button in the lower right of the main dialog.

    Roadway Designer dialog with Display Mode highlighted

    Figure 53

  6. Select the Vertical Adjustment Settings tool from the Overlay Tools pulldown.

    Overlay Tools pulldown

    Figure 54

  7. Provide settings similar to the ones in the dialog below.

    Vertical Overlay Adjustment Settings dialog

    Figure 55

  8. Provide a backbone thickness of 0.0
  9. Enable Use Minimum Milling.
  10. Toggle ON Maximum Milling and provide a value of 0.1
  11. Click OK
  12. Examine the results by stepping through the cross sections and reviewing in the Cross Section view.

ImportantNote that the backbone bottom is always between the Maximum Milling Value and the Minimum Milling Point.

Video
Minimum Overlay with Maximum Milling
  1. Access Roadway Designer from the Corridor Modeling dialog.

    Location of Roadway Designer on Corridor Modeler dialog

    Figure 56

  2. Create a corridor using a centerline alignment and an existing centerline profile.

    Manage Corridor dialog

    Figure 57

  3. Create a Template Drop using one of the predefined Overlay and Milling Templates.

    Template Drops dialog

    Figure 58

    ImportantUsing a small interval will produce more desirable results than using a large interval.

  4. Verify that the Active Surface is set to the existing ground

    Roadway Designer dialog with Active Surface highlighted

    Figure 59

  5. Change the Display Mode to Overlay by clicking the Overlay radio button in the lower right of the main dialog.

    Roadway Designer dialog with Display Mode highlighted

    Figure 60

  6. Select the Vertical Adjustment Settings tool from the Overlay Tools pulldown.

    Overlay Tools pulldown

    Figure 61

  7. Provide settings similar to the ones in the dialog below.

    Vertical Overlay Adjustment Settings dialog

    Figure 62

  8. Enable the Use Minimum Overlay option and provide a value of 0.20
  9. Enable Maximum Milling and provide a value of 0.10
  10. Click OK
  11. Examine the results by stepping through the cross sections and reviewing in the Cross Section view.

Vertical Alignments

  1. Access Roadway Designer from the Corridor Modeling dialog.

    Location of Roadway Designer on Corridor Modeler dialog

    Figure 63

  2. Create a corridor using a centerline alignment and an existing centerline profile.

    Manage Corridor dialog

    Figure 64

  3. Create a Template Drop using one of the predefined Overlay and Milling Templates.

    Template Drops dialog

    Figure 65

    ImportantUsing a small interval will produce more desirable results than using a large interval.  A smaller interval, 5’ or 10’, is also dependent on survey covering the area.

  4. Verify that the Active Surface is set to the existing ground

    Roadway Designer dialog with Active Surface highlighted

    Figure 66

  5. Change the Display Mode to Overlay by clicking the Overlay radio button in the lower right of the main dialog.

    Roadway Designer dialog with Display Mode highlighted

    Figure 67

  6. Select the Vertical Adjustment Settings tool from the Overlay Tools pulldown.

    Overlay Tools pulldown

    Figure 68

  7. Provide settings similar to the ones in the dialog below.

    Vertical Overlay Adjustment Settings dialog

    Figure 69

  8. Enable Use Minimum Overlay and provide a value of 0.20
  9. Enable Maximum Milling and provide a value of 0.15
  10. Click OK
  11. Click Process All to process the Corridor
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Smooth the Adjustment Result

Once the Vertical Adjustments produce a design requiring saving, a Vertical Alignment needs to be created and saved to the Geometry Project file. The Smooth Vertical Alignment and Apply Vertical Alignment command are used for this.

The first step in creating a vertical alignment from the Adjustment values is to use the Smooth Adjusted Vertical Alignment tool. This tool is used to create a best fit (regressed) vertical alignment from the active adjustment values.

  1. Select Smooth Overlay Vertical Alignment from the Overlay Tools pulldown.

    Overlay Tools pulldown

    Figure 63

  2. Key in a Toleranceof 0.2
  3. Clear the Create Linear Elements Only check box.
  4. Key in a Vertical Alignment Name of Smooth.

    Smooth Overlay Vertical Alignment dialog

    Figure 64

  5. Click Apply.

    ImportantNotice there are two new lines in the Roadway Designer Profile View – a yellow line that represents a bounding line and a green line that represents the regressed alignment.The Vertical Alignment is not added to the Geometry at this point. We will do that in the next section.

  6. Close the Smooth Overlay Vertical Alignment dialog.
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Create Alignments

The Apply Adjusted Vertical Alignment tool takes the Adjusted Vertical Alignment active in the Roadway Designer, assigns it a user‐selected Style, and creates the Vertical Alignment as a child of the Active Horizontal Alignment.

  1. Select Overlay Tools > Apply Adjusted Vertical Alignment.

    Overlay Tools pulldown

    Figure 65

  2. Ensure that Apply Adjusted Vertical Alignment to Corridor is set.
  3. For Style, select PR_Design Profile.
  4. Set the Bottom of Envelope option.
  5. Type in a Name of bottom.
  6. Set the Top of Envelope option.
  7. Type in a Name of top.

    Apply Adjusted Vertical Alignment

    Figure 66

  8. Click OK.

    ImportantThe Vertical Geometry was created.  The new profile may be imported back to GEOPAK Coordinate Geometry by returning to the Corridor Modeling dialog and selecting Tools > Export Profile.

    Export Profile to GPK dialog

    Figure 67

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