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Appendix L
Traffic Advice
Prepared by Cardno
Technical Memorandum
Title
Client
Date
Author
Reviewer
Yarrabilba Precinct 2 Village 4b
Traffic Impact Assessment
Lend Lease Communities
1 April 2015
Alexander Sargent
Brett McClurg (RPEQ 7628)
Project No
Status
Discipline
Office
CEB06339
Final
Traffic and Transport
Brisbane
Introduction
0B
Cardno has been commissioned by Lend Lease Communities, to undertake a traffic assessment of the
proposed Yarrabilba Precinct 2, Village 4b development.
The proposed development consists of 227 residential lots, and lies within the Yarrabilba master planned
development. The traffic and transport impact of the overall Yarrabilba development has been extensively
documented within numerous reports. These reported are listed below and have been referenced in this
current assessment. This memo therefore principally assesses whether the development matches the
previous assessments, or if further assessment is required.
Previous Reporting
10B
The development has been previously assessed within the following documents:
> Yarrabilba Masterplan – Micro-Simulation Modelling – Transport Assessment Report (Cardno,
August 2012)
> Yarrabilba Precinct 2 – Integrated Transport Assessment Report (Cardno, November 2013)
> Yarrabilba Masterplan – Micro-simulation Modelling – Revised Land Use and Road Network
(Cardno, November 2013)
> Yarrabilba Amended Movement Infrastructure Master Plan (Cardno, February 2014)
> Yarrabilba Precinct 2 – Yarrabilba Drive Intersection Configurations (Cardno, March 2014).
It is noted that an update to the Integrated Movement Plan (IMP), including updates to some of the above
studies, is expected to occur within the next few months. The update will consider changes made to the
overall Yarrabilba development, transport network, and transport impacts. It is not anticipated that the IMP
update will alter the findings of the assessment documented herein.
CEB06339 Precinct 2 Village 4b TIA 2015 04 01.docx
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Proposed Development
1B
The Yarrabilba Precinct 2, Village 4b will ultimately consist of 227 residential lots. Detailed plans of the full
development are shown at Appendix A. An overview of the proposed village location is shown on Figure1.
2B
Figure 1
Proposed Development – Village 4b
Note that one key change to the development plan is that the roadway running roughly through the centre
of the village from north-west to south-east will terminate at the open space corridor on the eastern edge
of the village. For this reason, it’s previously identified function as a Collector Street will be reduced to the
function of an Access Street.
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Traffic Generation
The proposed development has been previously modelled and reported within the approved Yarrabilba
Masterplan – Micro-Simulation Modelling – Transport Assessment Report (Cardno, August 2012) and
Yarrabilba Masterplan – Micro-simulation Modelling – Revised Land Use and Road Network (Cardno,
November 2013). This modelling informed the required road cross sections of the Yarrabilba development
and also informed analysis of the key intersections.
In order to determine that the micro-simulation modelling results are suitable for use in the assessment of
the proposed development, the proposed land-use yields of Precinct 2 Village 4b are compared to the
equivalent zones in the micro-simulation model in Table 1.
The areas of Precinct 2 Village 4a (323 lots) and Precinct 2 Village 4b (227 lots) sit entirely within model
zones 20, 21, 22, 23 and 34.
Table 1
Modelled versus Proposed Land Yield Comparison
Area
Proposed Development
Micro-simulation Model Yield
Residential Dwellings
Precinct 2 – Village 4a
323
Precinct 2 – Village 4b
227
Total
550
Zone 20
136
Zone 21
136
Zone 22
136
Zone 23
45
Zone 34
97
Total
550
Therefore the results of the Micro-simulation model remain appropriate for use as they consider the same
number of dwellings proposed in Precinct 2 Village 4a and Precinct 2 Village 4b.
4B
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Development Access
The development is accessed via Yarrabilba Drive, at two signalised intersections and one unsignalised
left-in-left-out intersection (See Figure 2).
These three intersections have been assessed in the Yarrabilba Precinct 2 - Yarrabilba Drive Intersection
Configurations document, to the 2051 ultimate development scenario using traffic volumes from the
Yarrabilba micro-simulation model previously reported. The recommended ultimate intersection formations
as a result of this analysis are discussed below, along with the intersection performance at the 2051 ultimate
development scenario.
Figure 2
Key Intersections
Signalised Intersection
Minor Intersection
11
12
16B
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Intersection 11
Intersection 11 will ultimately be constructed as a four way signalised intersection with a formation as shown
on Figure 3.
In the interim, it is proposed that the intersection be constructed with the formation as shown on Figure 3,
however the intersection will be unsignalised, with the southern leg constructed as a stub-leg until
Yarrabilba construction has progressed to a stage where signalisation is required. Potential triggers for the
signalisation include excessive delay on minor legs of the intersection causing unsafe manoeuvres, or the
opening of the southern leg of the intersection.
Figure 3
Intersection 11 Ultimate Layout
The proposed signalised four way intersection operates with a DOS of 0.28 in the AM peak and 0.24 in the
PM peak at the 2051 ultimate design horizon. All queues are contained in the provided short turn lanes.
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Intersection 12
17B
Intersection 12 will ultimately be constructed as a four way signalised intersection with a formation as shown
on Figure 4.
In the interim, it is proposed that the intersection be constructed with the formation as shown on Figure 4,
with or without the southern leg of the intersection, however the intersection will be unsignalised until the
construction of Yarrabilba has progressed to a stage where signalisation is required. Potential triggers for
the signalisation include excessive delay on minor legs of the intersection causing unsafe manoeuvres, or
the opening of the southern leg of the intersection.
Figure 4
Intersection 12 Ultimate Layout
The proposed signalised four way intersection operates with a DOS of 0.27 in the AM peak and 0.22 in the
PM peak at the 2051 ultimate design horizon. All queues are contained in the proposed short turn lanes.
Unsignalised Intersection (Shown on Figure 2)
18B
A left-in-left-out intersection is proposed, providing interim access to a display village within Precinct 2
Village 4a during its operation (subject to a separate application). It is proposed that this intersection remain
after the conversion of the display village to conventional dwellings. While this intersection has not been
previously assessed (i.e. traffic capacity analysis), the left-in-left-out formation of the intersection will cause
minimal delays to Yarrabilba Drive, and will reduce movements at the adjacent signalised intersections. It
is therefore considered appropriate.
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Development Layout
The proposed street layout within the development plan includes three four-way unsignalised intersections.
Given the proposed road hierarchy and the collector street access arrangements to Yarrabilba Drive, the
intersections on the collector street (east-west) will have a clear priority direction, with the lower priority legs
having a very limited catchment. The other two unsignalised four-way intersections are between lower order
local streets and the priority can be determined at the detailed design stage (and appropriate give way or
stop sign control implemented) to suit the specific need of the intersection and to discourage long straight
sections of street (where speed may become an issue). Nonetheless, particular care must be made in the
detailed design of these intersections to ensure that the visibility of the intersection remains high at all times.
The priority of movements at the intersection must be marked with give-way or stop signs on two legs.
Street Cross Sections and Road Hierarchy
The proposed road hierarchy for Precinct 2 of the Yarrabilba Development has been previously detailed in
the Yarrabilba Precinct 2 – Integrated Transport Assessment (Cardno, November 2013). The cross sections
proposed (shown on plans at Appendix A) are dictated by the proposed road hierarchy and strategic uses
of the roads, for example key active transport routes or bus routes. Figure 5 shows the road hierarchy within
the proposed Precinct 2, with Figure 6 showing the proposed public transport routes, and Figure 7 showing
the proposed active transport routes.
The proposed road reserves allow for the required cross sections as described in the Integrated Transport
Assessment, with the exception of the east-west Collector Street that was included in the Integrated
Transport Assessment and is shown below on Figure 5. This collector route was identified as such in the
Integrated Transport Assessment due to a potential future vehicular connection between Village 4b and an
adjacent future village to the east. It has been determined that this vehicular link is no longer required,
therefore this Local Collector has been downgraded to a Local Street (With Greenway) classification, and
the cross section amended as such.
This change is the sole deviation from the approved Integrated Transport Assessment. Including this
change, the proposed development cross sections are in line with the intent of the Integrated Transport
Assessment, and are suitable for the proposed development.
Figure 5
Precinct 2 - Road Hierarchy
Precinct 2 Village 4b Boundary
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Public Transport
Figure 6 shows the identified public transport routes throughout Precinct 2 of the development. The
proposed Village 4b is highlighted. Public transport will be provided in a staged fashion until the
development is complete, and as market dictates. For instance developed areas will be prioritised for public
transport routes, until undeveloped areas begin to be occupied.
As currently planned, the entire Village 4b catchment is within 400m of an identified bus route. Whilst the
future Sothern Infrastructure Corridor (SIC) will provide a barrier to such a 400m distance, when such a
barrier is considered, 85% of Village 4b is within 400m of a bus route. Notwithstanding the latter, the
proposed layout and bus routes for the entire Precinct 2 are considered appropriate for the public transport
needs.
Figure 6
Precinct 2 – Public Transport Coverage
Precinct 2 Village 4b Boundary
6B
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Active Transport
Figure 7 shows the designated active transport routes throughout the proposed development. The southern
side of the east-west Collector Street through Village 4b, is designated as Greenway Corridor, and will
include 2.5m wide shared paths to encourage active transport access to the school by students and parents.
Figure 7
Precinct 2 – Active Transport Network
Precinct 2 Village 4b Boundary
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Summary
Cardno have been commissioned by Lend Lease Communities to conduct a traffic assessment of a portion
of the Yarrabilba community development. The portion, known as Precinct 2, Village 4b, will ultimately
consist of 227 residential lots.
The proposed development is broadly consistent with that proposed in the Yarrabilba Masterplan. The
proposed development is of the same scale as that previously modelled in the approved Yarrabilba
Masterplan – Micro-Simulation Modelling – Transport Assessment Report.
The access intersections from Yarrabilba Drive will be constructed to near-full formation as specified in the
Yarrabilba Precinct 2 - Yarrabilba Drive Intersection Configurations document. Signalisation of the two
intersections on Yarrabilba Drive is proposed and this may be staged until the construction of Yarrabilba
has progressed to a stage where signalisation is required.
Three unsignalised four-way intersections are proposed in the development layout. These must be
designed and constructed to a standard that allows for clear sight lines and clarity of priority, i.e. through
give way or stop signage.
The development allows for active and public transport, as approved in the Yarrabilba Amended Movement
Infrastructure Master Plan, with cross sections catering for active and public transport, and the required
traffic movements.
In summary, the proposed development is consistent with that proposed in the previously approved body
of traffic analysis documents for the Yarrabilba Development (with the exception of a minor road hierarchy
change) and the traffic and transport arrangements that are now proposed are considered to be appropriate.
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Yarrabilba Precinct 2 Village 4b Traffic Impact Assessment
Yarrabilba Precinct 2 Village 4b
APPENDIX A
DEVELOPMENT PLAN
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JAS
By
Suite 4, Robina East Quay Corporate Park
(North Building) 34-36 Glenferrie Drive, Robina
PO Box 1048 Robina DC, Qld 4226
RPS Australia East Pty Ltd
ACN 140 292 762
ABN 44 140 292 762
MAR/15
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APPROVAL
LOCALITY PLAN
A
No
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PRECINCT 2
PRELIMINARY PLANNING
FUNCTIONAL DRAWINGS
ABN 35 112 053 611
LEVEL 2 - 71 GREY STREET
SOUTH BRISBANE
QUEENSLAND 4101
[email protected]
PHONE 07 3017 1900
FAX 07 3017 1911
EMAIL
GBG
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REVISIONS
No
Description
A
APPROVAL
Date
By
MAR/15
JAS
Associated Consultants
RPS Australia East Pty Ltd
ACN 140 292 762
ABN 44 140 292 762
Suite 4, Robina East Quay Corporate Park
(North Building) 34-36 Glenferrie Drive, Robina
PO Box 1048 Robina DC, Qld 4226
T +61 7 555 36900
F +61 7 555 36999
C COPYRIGHT PROTECTS THIS PLAN
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not permitted. Please contact the author.
W rpsgroup.com.au
Client
Project
PRECINCT 2
PRELIMINARY PLANNING
FUNCTIONAL DRAWINGS
LEVEL 2 - 71 GREY STREET
SOUTH BRISBANE
QUEENSLAND 4101
[email protected]
PHONE 07 3017 1900
FAX 07 3017 1911
EMAIL
ABN 35 112 053 611
Approved - RPEQ 12805
Drawing Title
Drawn
Designed
JAS
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GBG
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Date
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FU
TU
RE
AR
TE
RIA
L)
REVISIONS
No
Description
A
APPROVAL
Date
By
MAR/15
JAS
Associated Consultants
RPS Australia East Pty Ltd
ACN 140 292 762
ABN 44 140 292 762
Suite 4, Robina East Quay Corporate Park
(North Building) 34-36 Glenferrie Drive, Robina
PO Box 1048 Robina DC, Qld 4226
T +61 7 555 36900
F +61 7 555 36999
C COPYRIGHT PROTECTS THIS PLAN
Unauthorised reproduction or amendment
not permitted. Please contact the author.
W rpsgroup.com.au
Client
Project
PRECINCT 2
PRELIMINARY PLANNING
FUNCTIONAL DRAWINGS
LEVEL 2 - 71 GREY STREET
SOUTH BRISBANE
QUEENSLAND 4101
[email protected]
PHONE 07 3017 1900
FAX 07 3017 1911
EMAIL
ABN 35 112 053 611
Approved - RPEQ 12805
Drawing Title
Drawn
Designed
JAS
Checked
GBG
Scale
MAR 15
Sheet
AS SHOWN
of
Drawing No
A1
Date
13-106-SK154
Revision
B
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DO NOT SCALE THIS DRAWING
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NORTH
LOCALITY PLAN
REVISIONS
No
Description
A
APPROVAL
Date
By
MAR/15
JAS
Associated Consultants
RPS Australia East Pty Ltd
ACN 140 292 762
ABN 44 140 292 762
Suite 4, Robina East Quay Corporate Park
(North Building) 34-36 Glenferrie Drive, Robina
PO Box 1048 Robina DC, Qld 4226
T +61 7 555 36900
F +61 7 555 36999
C COPYRIGHT PROTECTS THIS PLAN
Unauthorised reproduction or amendment
not permitted. Please contact the author.
W rpsgroup.com.au
Client
Project
PRECINCT 2
PRELIMINARY PLANNING
FUNCTIONAL DRAWINGS
LEVEL 2 - 71 GREY STREET
SOUTH BRISBANE
QUEENSLAND 4101
[email protected]
PHONE 07 3017 1900
FAX 07 3017 1911
EMAIL
ABN 35 112 053 611
Approved - RPEQ 12805
Drawing Title
Drawn
Designed
JAS
Checked
GBG
Scale
MAR 15
Sheet
AS SHOWN
of
Drawing No
A1
Date
13-106-SK155
Revision
C
-