welcome to intersection design presented at: bentley 2009 roads and bridge conference charlotte,...

WelcomeTo

Intersection Design

Presented at:Bentley 2009 Roads and Bridge ConferenceCharlotte, North Carolina

Presented by:Dirk Karasek

The Envision Group, Inc.

www.EnvisionCAD.com

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 curvecommand createshorizontal 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


Quick overview

• Templates are run perpendicular to the reference lines• Only 1 template is required for each roadway


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


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


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


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 MethodTemplate ‘bends’ at secondary alignment

Orig

in

Secondary Alignment MethodTemplate ‘bends’ at secondary alignment


Triangulation results


Suitable when matching minor road to edge of major road

Multiple Adjoining/Corridors Quick overview

• All template origins are tied to horiz/vert alignments


• All template origins are tied to horiz/vert alignments • Templates are run perpendicular to the reference lines


• 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


• 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


• 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


• 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



templates• ~ 13 corridors required



templates• ~ 13 corridors required• User must determine template start/stop limits



templates• ~ 13 corridors required• User must determine template start/stop limits• Corridor definitions can be complex



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



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


Corridors• Mainline corridor contains a single template entry• Sideroad corridor contains a single template entry


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



Sequence of events

1. The mainline ‘clips’ the sideroad model

2. The quadrants ‘clip’ both the mainline and sideroad models



Sequence of events1. The mainline ‘clips’ the sideroad model2. The quadrants ‘clip’ both the mainline and sideroad

models3. A single composite surface is created

Clipping CorridorsTemplate along radius returns

Orig

inO

rigin

Point controls used to target mainline or sideroad corridors

Variableslope & length

Clipping CorridorsTemplates placed perpendicular or radial

Crownline

Targeted

Quadrant corridor

Edge of thru-la

ne

Targeted

Normal end-condition applied

Overlapping/Clipping Corridors Contours


Suitable when matching minor road to edge of major road or crown to crown


Pros & Cons• Mainline and side road each require only 1 template


Pros & Cons• Mainline and side road each require only 1 template• 1 template for all quadrants


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


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


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)


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 ConferenceCharlotte, North Carolina

Presented by:Dirk Karasek

The Envision Group, Inc.

www.EnvisionCAD.com

welcome to intersection design presented at: bentley 2009 roads and bridge conference charlotte,...

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