© 2009 Bentley Systems, Incorporated Corey Johnson-Bentley Intersection Design with Roadway Designer

© 2009 Bentley Systems, Incorporated 2 | Objectives Preliminary Design Surfaces Radius Return Creation Defining Point Controls/Secondary Alignments Final Design Surface Creation

© 2009 Bentley Systems, Incorporated 3 | Starting InRoads/Geopak Start InRoads or Geopak Load the files for this Lesson

© 2009 Bentley Systems, Incorporated 4 | Preliminary Design Two Corridors have been created –CL-278 (Main Roadway) –Reloc (Side Road) CL-278 has Style Constraint for Widening Reloc has Point Control for Right Turn Lane widening Both Corridors have Superelevation Defined

© 2009 Bentley Systems, Incorporated 5 | Create Surfaces Analyze the Preliminary Corridors Create Preliminary Design Surfaces

© 2009 Bentley Systems, Incorporated 6 | 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

© 2009 Bentley Systems, Incorporated 7 | Create Radius Geometry Create Radius returns for NW and SW Quadrant of Intersection Review the Results with the Geometry and Profile Commands

© 2009 Bentley Systems, Incorporated 8 | 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

© 2009 Bentley Systems, Incorporated 9 | Modeling the Side Road Assign Radius Return Alignments as Point Controls Increase the template drop interval at PC Generate Design Surface for Reloc –Enable Add Transverse Features

© 2009 Bentley Systems, Incorporated 10 | 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

© 2009 Bentley Systems, Incorporated 11 | Create the Finished Surface Create One Surface from Multiple Corridors Review the Results

© 2009 Bentley Systems, Incorporated 12 | Other Techniques for Intersections Targeting Design Surface Features Parent/Child Components End Condition Exceptions Other Possible tools to consider –Corridor Clipping –Target Aliasing

© 2009 Bentley Systems, Incorporated 13 | 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

© 2009 Bentley Systems, Incorporated 14 | Summary and Review You are now able to… Before continuing let’s reinforce what you have learned!