Welcome To Intersection Design Presented at: Bentley 2009 Roads and Bridge Conference Charlotte, North Carolina Presented by: Dirk Karasek The Envision Group, Inc.

Goal A Comprehensive Intersection Model

Methods Options Secondary Alignments

Methods Options Secondary Alignments Multiple Adjoining Corridors

Methods Options Secondary Alignments Multiple Adjoining Corridors Overlapping/Clipping Corridors

Radius Returns All three options require radius return alignments The multicenter curve command creates horizontal alignments

Radius Returns All three options require radius return alignments It also can create vertical alignments

Secondary Alignment Method Quick overview Templates are run perpendicular to the reference lines

Secondary Alignment Method Quick overview Templates are run perpendicular to the reference lines Only 1 template is required for each roadway

Secondary Alignment Method Quick overview Templates are run perpendicular to the reference lines Only 1 template is required for each roadway All template origins are tied to reference line alignments

Secondary Alignment Method Quick overview Templates are run perpendicular to the reference lines Only 1 template is required for each roadway All template origins are tied to reference line alignments Radius returns are defined as ‘secondary’ alignments

Secondary Alignment Method Quick overview Templates are run perpendicular to the reference lines Only 1 template is required for each roadway All template origins are tied to reference line alignments Radius returns are defined as ‘secondary’ alignments The template ‘bends’ at the secondary alignment

Secondary Alignment Method Quick overview Templates are run perpendicular to the reference lines Only 1 template is required for each roadway All template origins are tied to reference line alignments Radius returns are defined as ‘secondary’ alignments The template ‘bends’ at the secondary alignment The radius return alignment is a horizontal control only

Secondary Alignment Method Template ‘bends’ at secondary alignment Origin

Secondary Alignment Method Template ‘bends’ at secondary alignment

Secondary Alignment Method Triangulation results

Secondary Alignment Method Suitable when matching minor road to edge of major road

Multiple Adjoining/Corridors Quick overview All template origins are tied to horiz/vert alignments

Multiple Adjoining/Corridors Quick overview All template origins are tied to horiz/vert alignments Templates are run perpendicular to the reference lines

Multiple Adjoining/Corridors Quick overview All template origins are tied to horiz/vert alignments Templates are run perpendicular to the reference lines Templates are also run radial to the radius returns

Multiple Adjoining/Corridors Quick overview All template origins are tied to horiz/vert alignments Templates are run perpendicular to the reference lines Templates are also run radial to the radius returns A single template is used for the radius returns

Multiple Adjoining/Corridors Quick overview All template origins are tied to horiz/vert alignments Templates are run perpendicular to the reference lines Templates are also run radial to the radius returns A single template is used for the radius returns Vertical alignments along radius returns can be edited to control the edge of pavement or curb flowlines

Multiple Adjoining/Corridors Quick overview All template origins are tied to horiz/vert alignments Templates are run perpendicular to the reference lines Templates are also run radial to the radius returns A single template is used for the radius returns Vertical alignments along radius returns can be edited to control the edge of pavement or curb flowlines Corridors can overlap and will automatically ‘clip’ underlying corridors.

Multiple Adjoining/Corridors

Cons & Pros Mainline and side road each require 3 or 4 unique templates

Multiple Adjoining/Corridors Cons & Pros Mainline and side road each require 3 or 4 unique templates ~ 13 corridors required

Multiple Adjoining/Corridors Cons & Pros Mainline and side road each require 3 or 4 unique templates ~ 13 corridors required User must determine template start/stop limits

Multiple Adjoining/Corridors Cons & Pros Mainline and side road each require 3 or 4 unique templates ~ 13 corridors required User must determine template start/stop limits Corridor definitions can be complex

Multiple Adjoining/Corridors Cons & Pros Mainline and side road each require 3 or 4 unique templates ~ 13 corridors required User must determine template start/stop limits Corridor definitions can be complex Changes in design require revisiting many template/station entries

Multiple Adjoining/Corridors Cons & Pros Mainline and side road each require 3 or 4 unique templates ~ 13 corridors required User must determine template start/stop limits Corridor definitions can be complex Changes in design require revisiting many template/station entries Finished model is complete with surfaces and components

Overlapping/Clipping Corridors

Corridors Mainline corridor contains a single template entry

Overlapping/Clipping Corridors Corridors Mainline corridor contains a single template entry Sideroad corridor contains a single template entry

Overlapping/Clipping Corridors Corridors Mainline corridor contains a single template entry Sideroad corridor contains a single template entry Each quadrant contains a single template entry

Overlapping/Clipping Corridors Corridors Mainline corridor contains a single template entry Sideroad corridor contains a single template entry Each quadrant contains a single template entry Sequence of events 1.The mainline ‘clips’ the sideroad model

Overlapping/Clipping Corridors Corridors Mainline corridor contains a single template entry Sideroad corridor contains a single template entry Each quadrant contains a single template entry Sequence of events 1.The mainline ‘clips’ the sideroad model 2.The quadrants ‘clip’ both the mainline and sideroad models

Overlapping/Clipping Corridors Corridors Mainline corridor contains a single template entry Sideroad corridor contains a single template entry Each quadrant contains a single template entry Sequence of events 1.The mainline ‘clips’ the sideroad model 2.The quadrants ‘clip’ both the mainline and sideroad models 3.A single composite surface is created

Clipping Corridors Template along radius returns Origin Point controls used to target mainline or sideroad corridors Variable slope & length

Clipping Corridors Templates placed perpendicular or radial Crownline Targeted Quadrant corridor Edge of thru-lane Targeted Normal end- condition applied

Overlapping/Clipping Corridors Contours

Overlapping/Clipping Corridors Suitable when matching minor road to edge of major road or crown to crown

Overlapping/Clipping Corridors Pros & Cons Mainline and side road each require only 1 template

Overlapping/Clipping Corridors Pros & Cons Mainline and side road each require only 1 template 1 template for all quadrants

Overlapping/Clipping Corridors Pros & Cons Mainline and side road each require only 1 template 1 template for all quadrants Total of 6 corridors required

Overlapping/Clipping Corridors Pros & Cons Mainline and side road each require only 1 template 1 template for all quadrants Total of 6 corridors required Easy to define corridors

Overlapping/Clipping Corridors Pros & Cons Mainline and side road each require only 1 template 1 template for all quadrants Total of 6 corridors required Easy to define corridors Creates composite surfaces DTM(s)

Overlapping/Clipping Corridors Pros & Cons Mainline and side road each require only 1 template 1 template for all quadrants Total of 6 corridors required Easy to define corridors Creates composite surfaces DTM(s)

Overlapping/Clipping Corridors Pros & Cons Mainline and side road each require only 1 template 1 template for all quadrants Total of 6 corridors required Easy to define corridors Creates composite surfaces DTM(s) Changes in design may require recreation of radius returns

Demo/Questions?

Thank You! Intersection Design Presented at: Bentley 2009 Roads and Bridge Conference Charlotte, North Carolina Presented by: Dirk Karasek The Envision Group, Inc.