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Approved Plans OPW16/0118
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NOOSA COUNCIL
APPROVED PLAN
OPW16/0118 27 SEP 2016
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NOOSA COUNCIL
APPROVED DOCUMENT
OPW16/0118 27 SEP 2016
Sight Distance Report
390 David Low Way, Peregian Beach (GTP 102586)
July 2016
Prepared By: 360 Civil Consulting Pty Ltd
Prepared For: The Retreat Beach Houses, Peregian Beach
Reference: 2016045-rpt001
360 Civil Consulting Pty Ltd
Mobile: 0403 862 009
Email: [email protected]
ABN: 13 609 593 339
ACN: 609 593 339
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Disclaimer This report has been prepared for the client. It is subject to the provisions of the agreement between 360 Civil Consulting Pty Ltd and the client. Report results should not be used for purposes other than those for which they were prepared. Report Status Reference Date Status Author Approval 2016045-rpt001 30/07/16 FINAL BG BG
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report Table of Contents 1. Introduction ........................................................................................................................ 4 2. Site Description................................................................................................................... 4 3. Existing Road Conditions – David Low Way........................................................................ 5 4. Proposed Landscaping Amendments ................................................................................. 6 5. Vehicle sight distance assessment ..................................................................................... 7 6. Pedestrian sight distance assessment ................................................................................ 9 7. Proposal to achieve pedestrian sight lines ....................................................................... 11 8. Horizontal clearance requirements .................................................................................. 12 9. Conclusions and Recommendations ................................................................................ 13 Appendix A – Proposed stone wall at entrance to The Retreat, Peregian Beach ................... 14 2016045-rpt001-The Retreat - Report Rev B Page 3 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
1. Introduction
This report has been completed by 360 Civil Consulting Pty Ltd for the purpose of providing
a sight distance assessment for the proposed landscaping walls at the entrance of 390 David
Low Way, Peregian Beach (The Retreat Beach Houses).
This report is in response to an Information Request issued by Noosa Council dated 5 July
2016 in which Council have advised that they have concerns that the “proposed walls will
impeded the necessary sight lines to pedestrians and vehicles on David Low Way for vehicles
exiting the site”.
A site inspection to assess sight distances was undertaken on 11th July 2016 and 19th July
2016. The sight lines have been assessed against the requirements of AS/NZS2890.1:2004.
2. Site Description
The Retreat Beach Houses are located at 390 David Low Way, Peregian Beach and are
situated on the eastern side of David Low Way. The development has two-way access from
David Way Low.
Figure 1 – 390 David Low Way, Peregian Beach – access location (image courtesy of
Google Maps)
2016045-rpt001-The Retreat - Report Rev B Page 4 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
Figure 2 – 390 David Low Way, Peregian Beach – two way access (image courtesy of
Google Maps)
3. Existing Road Conditions – David Low Way
David Low Way in front of the development site is classified as an Arterial Road as defined in
Noosa Council’s Road Network Trunk Infrastructure Mapping. David Low Way along the
development frontage: -
has a posted speed limit of 60km/h;
is fully kerbed on both sides;
has a road width of approximately 15m and includes two 3.7m wide traffic lanes
with 4m wide shoulders; and
has a 2m wide footpath on the eastern side.
The access to 390 David Low Way currently has a series of timber bollards located along the
kerb line leading into the site (as shown in Figure 2 above).
The driveway gradient for vehicles exiting The Retreat and accessing David Low Way is on an
incline. Parts of this driveway gradient were measured to be approximately 23% however at
the location where vehicles wait to access David Low Way the driveway was measured to
have an approximate gradient of 7%.
2016045-rpt001-The Retreat - Report Rev B Page 5 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
Figure 3 – David Low Way in front of the access to 390 David Low Way – view to the south
4. Proposed Landscaping Amendments
The access to 390 David Low Way currently has a series of timber bollards located along the
kerb line leading in to the site (as shown in Figure 2). The landscaping proposal for the
access involves replacing the existing timber bollards with a stone wall similar to the stone
walls located within the site (as shown in Figure 4).
Details of the proposed stone wall are included in Appendix A.
Figure 4 – Existing stone walls located within the development site
2016045-rpt001-The Retreat - Report Rev B Page 6 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
The height of the existing timber bollards is approximately 1m. The height of the proposed
stone wall is approximately 600mm at the closest point to David Low Way, increasing in
height to 1m before stepping down to a 600mm height.
It is proposed that the alignment of the stone wall will be similar to the current alignment of
the existing timber bollards.
Existing timber
bollard approx.
height 1m
Proposed
600mm height
of stone wall
Figure 5 – Existing timber bollards located at the access to 390 David Low Way
5. Vehicle sight distance assessment
Vehicle sight distances for the access were assessed against the requirements of
AS2890.1:2004 Section 3.2.4 and Figure 3.2. When assessing these sight distances the
impact of the proposed stone walls were accounted for. The 2.5m set back of the driver’s
position was measured from the edge of kerb rather than from the edge of traffic lane. The
measured sight distances are recorded in Table 1. Figures 6 and 7 show the sight distances
observed from the access location.
2016045-rpt001-The Retreat - Report Rev B Page 7 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
Table 1 – Sight Distance from access from 390 David Low Way, Peregian Beach
Safe Sight Distance
Requirements as per AS2890.1 Sight Distances as measured
Frontage Road (Figure 3.2) for a Domestic for 390 David Low Way
Speed (km/h) Property
101m to the north
60 55
155m to the south
Figure 6 – Observed sight distance from 390 David Low Way access to the north
2016045-rpt001-The Retreat - Report Rev B Page 8 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
Figure 7 – Observed sight distance from 390 David Low Way access to the south
As Figures 5 and 6 show the existing timber bollards and the proposed location of the stone
wall are outside the area of influence of measuring sight distances for vehicles. As a result
of this assessment it has been determined that the proposal to install stone walls in the
location of the existing timber bollards will not impede on the necessary sight distances to
vehicles on David Low Way for vehicles exiting the site.
6. Pedestrian sight distance assessment
The necessary sight distances required for pedestrians were assessed against the
requirements of AS2890.1:2004 Section 3.2.4 and Figure 3.3.
Due to the driveway to 390 David Low Way being two way the required sight triangle on the
northern side of the driveway is not required.
The property boundary to 390 David Low Way has been measured and determined utilising
aerial photography. The property boundary is approximately 14.2m from the David Low
Way road centre line (Figure 8).
2016045-rpt001-The Retreat - Report Rev B Page 9 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
~14.2m
Figure 8 – 390 David Low Way - Property boundary location
AS2890.1 Figure 3.3 details the required sight distance triangles that are to be clear of
obstructions in order to ensure pedestrian safety.
During the site inspection the sight distance for a vehicle located approximately 2.5m back
from the property boundary was measured and there was no clear sight line to the
pedestrian footpath (Figure 9). The current driveway situation does not comply with the
sight line requirements of AS2890.1 Figure 3.3. The proposal to install a stone wall behind
the kerb line, in place of the existing timber bollards, would also obstruct the required sight
lines and this proposal would not comply with the requirements of AS2890.1 Figure 3.3.
Joint in asphalt
pavement indicates
the approximate
Property Boundary
location
Figure 9 – Current sight line from vehicle exiting The Retreat to the pedestrian footpath
2016045-rpt001-The Retreat - Report Rev B Page 10 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
7. Proposal to achieve pedestrian sight lines
The property boundary of 390 David Low Way is approximately 3.5m from the edge of the
footpath. Providing a clear sight line triangle based on the property boundary location
would not ensure that pedestrian safety is achieved as vegetation, bollards (and the
proposed stone wall) would still obstruct sight lines between vehicles exiting 390 David Low
Way and pedestrians. As a result of this the location of the required sight triangle has been
adjusted and is outlined in Figures 10. Figures 10 also shows the proposed extent of area
that is to remain free in order to achieve the required sight lines.
Area to be kept clear of
obstructions to achieve sight line.
Proposed location where the sight
Approximate Property triangle has been measured from.
Boundary Location
Figure 10 – Basis of sight line triangle measurements
Figure 11 overleaf provides further detail regarding the area that is to be kept clear of
obstructions to visibility.
2016045-rpt001-The Retreat - Report Rev B Page 11 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
Additional zone to be clear of
obstructions to visibility
2.5m x 2m sight triangle
as required by AS2890.1
Additional zone to be
clear of obstructions to
visibility
Figure 11 – Sight clearance area required for 390 David Low Way as required by AS2890.1
(Figure 3.3) and Austroads
In order to keep the areas shown in Figure 11 clear of obstructions to visibility it is
recommended that: -
The proposed stone wall be constructed along the boundary of the clear zones
shown in Figure 11;
Existing vegetation in the clear zone area be removed / reduced in height;
Any new vegetation in the clear zone area be low planting (approximately 300mm
high and maintained at this level); and
The proposed stone wall achieve a 0.5m offset from the edge of the footpath (refer
to Section 8 below).
8. Horizontal clearance requirements
Austroads Guide to Road Design Part 6A: Pedestrian and Cyclist Paths requires that a
minimum lateral clearance of 0.5m should be provided between the edge of any path for
cycling and any obstacle, which if struck may result in cyclists losing control or being injured.
The location of the existing timber bollards is within 0.5m of the edge of the path. It is
recommended that the proposed stone wall be constructed to ensure that a minimum 0.5m
clearance from the edge of the pedestrian path is achieved for cyclist safety. This 0.5m
clearance should occur on both the northern and southern sides of the driveway.
2016045-rpt001-The Retreat - Report Rev B Page 12 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report
9. Conclusions and Recommendations
360 Civil Consulting has completed an assessment of the vehicle and pedestrian sight
distances and whether these sight lines will be impeded by the construction of a new stone
wall at the entrance to The Retreat.
360 Civil Consulting conclude the following: -
Vehicle sight distances will not be impeded by the proposed stone wall;
Pedestrian sight distances are currently inadequate on the southern side of the
driveway and the proposed stone wall will not improve or resolve this inadequate
pedestrian sight distance; and
The existing timber bollards are located within 0.5m of the edge of path which is not
in accordance with Austroads guidelines.
As a result of this investigation, 360 Civil Consulting recommend that the following occur: -
Southern side of the driveway
1. The proposed stone wall be constructed along the boundary of the clear zones
shown in Figure 11;
2. Existing vegetation in the clear zone area be removed / reduced in height; and
3. Any new vegetation in the clear zone area be low planting (maximum height of
approximately 300mm high and maintained at this level).
Southern and Northern side of the driveway
4. On both sides of the driveway, the proposed stone wall maintain a minimum
clearance of 0.5m from the edge of the existing pedestrian path.
2016045-rpt001-The Retreat - Report Rev B Page 13 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report Appendix A – Proposed stone wall at entrance to The Retreat, Peregian Beach 2016045-rpt001-The Retreat - Report Rev B Page 14 of 15
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390 David Low Way, Peregian Beach (The Retreat) Sight Distance Report 2016045-rpt001-The Retreat - Report Rev B Page 15 of 15
Used in these records
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