© 2009 bentley systems, incorporated corey johnson-bentley intersection design with roadway...
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Corey Johnson-Bentley
Intersection Design with Roadway Designer
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Objectives
Preliminary Design Surfaces
Radius Return Creation
Defining Point Controls/Secondary
Alignments
Final Design Surface Creation
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Starting InRoads/Geopak
• Start InRoads or Geopak
• Load the files for this Lesson
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Preliminary Design
• Two Corridors have been created
– CL-278 (Main Roadway)– Reloc-2 278 (Side Road)
• CL-278 has Style Constraint for Widening
• Reloc-2 278 has Point Control for Right Turn Lane widening
• Both Corridors have Superelevation Defined
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Create Surfaces
• Analyze the PreliminaryCorridors
• Create PreliminaryDesign Surfaces
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Multi-Center Curve Command• Creates both Horizontal and
Vertical Curves based on two alignments
• One, Two or Three Center Curves can be created
• Vertical Curves are created that match the instantaneous longitudinal grade at PVC and PVT
• Vertical Geometry Options– Vertical Distance– Gradient– Surface (Useful when the cross
slope varies ie. Superelevation)
• Always Review the Results and make adjustments if necessary
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Create Radius Geometry
• Create Radius returns for NW and SW Quadrant of Intersection
• Review the Results with the Geometry and Profile Commands
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Point Controls and Secondary Alignments
• Used to Modify the Behavior of Template Points
• Overrides Existing Point Constraints
• Priority can be used to resolve conflicting point controls
• Secondary Alignments control the direction of cross section processing
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Modeling the Side Road
• Assign Radius ReturnAlignments as Point Controls
• Increase the template drop interval at PC
• Generate Design Surface for Reloc-2 278– Enable Add Transverse
Features
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Modeling the Main Line
• Assign Radius Return Alignments as Point Controls for the main line
• Increase the template drop interval
• Add/Edit template drop for intersection
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Create the Finished Surface
• Create One Surface from Multiple Corridors
• Review the Results
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Other Techniques for Intersections
• Targeting Design Surface Features
• Parent/Child Components
• End Condition Exceptions
• Other Possible tools to consider– Corridor Clipping– Target Aliasing
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Skewed Intersections• Change the active
corridor
• Use Parent/Child Components and End Condition Exceptions for another intersection
• Create Surface for Side Roads
• Use transverse feature from Side Road surface as a point control for the main line
• Process and generate one surface from all three corridors
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Summary and Review
You are now able to…
Before continuing let’sreinforce what
you have learned!