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Traffic Engineering Advice
Attached to the e-mail REC16/0014 - Planning report & supporting management plans, contour plan 2 of 2.
RE: ELKHORN DRIVE, TEWANTIN
TRAFFIC ENGINEERING ADVICE
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a ——_—
PEKOL TRAFFIC & TRANSPORT
ABN 96 067 593 962
P 07 3839 6771
PEKOL TRAFFIC & TRANSPORT Level G 67 St Pauls Tce
Spring Hill Q 4000
WWW.PTT.COM.AU
18 December 2015
Elkhorn Investments (QLD) Pty Ltd
C/- KHA Development Managers
1 Surf Road
Maroochydore QLD 4558
Attention: Scott Sobey
Dear Scott
RE: ELKHORN DRIVE, TEWANTIN
TRAFFIC ENGINEERING ADVICE
We have undertaken a review of the proposed residential subdivision development at Lot 70 on M37807 in
Tewantin. The proposed development comprises the extension of Elkhorn Drive to provide 11 lots (ie 10 new
lots and the existing detached dwelling). The extension would be supported by a “single movement” turning head
facility. The proposed subdivision layout is shown in Figure 1.
Elkhorn Drive is an existing residential cul-de-sac which currently serves a total of 25 lots. It runs north from a
priority controlled intersection with George Street where it forms the minor approach. It currently has a length
of approximately 250m, with a road reserve width of 20m and a carriageway width (measured kerb-to-kerb) of
11m. Based on the existing reserve and carriageway width, Elkhorn Drive would be classified as a “Collector
Road” according to the Noosa Plan (Planning Scheme Policy 5: Engineering Design Standards — Roads, Drainage
and Earthworks). However, in terms of the number of lots served (ie 25 lots) and the daily vehicle volumes, it
would operate more like an “Access Road”.
Elkhorn Drive currently has no turning facility at the end of the cul-de-sac. Therefore, refuse collection vehicles
are currently required to undertake a multi-point turn manoeuvre in order to serve Elkhorn Drive.
The proposed residential subdivision development would result in the following:
— anincrease in the length of Elkhorn Drive to approximately 350m (ie an increase of 100m)
— an additional 10 lots (ie a total catchment of 35 lots served by Elkhorn Drive)
— the provision of a formal turning facility at the end of the cul-de-sac
AU
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PEKOL TRAFFIC & TRANSPORT
The additional traffic generated by the 10 new lots would result in the total catchment of Elkhorn Drive
remaining well below the recommended maximum for this road type (ie a maximum of 60 lots or 600 vehicle
movements per day for an Access Road, as defined in Planning Scheme Policy 5 of the Noosa Plan). Therefore,
the additional traffic movements generated by the proposed development would have a negligible impact on
safety, amenity and convenience.
Furthermore, the provision of a dedicated turn facility would provide a significant improvement over the
existing conditions by enabling vehicles (and in particular refuse collection vehicles) to turn around safely at the
end of Elkhorn Drive. It is recommended that the single movement turning facility has a minimum radius of
9m (ie an 18m diameter) as required by Planning Scheme Policy 5 of the Noosa Plan. Swept paths demonstrating
the refuse collection vehicle making a turn manoeuvre via the proposed turning head facility are shown in Figure
2.
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PEKOL TRAFFIC & TRANSPORT
Figure 2: REFUSE COLLECTION VEHICLE SWEPT PATHS
6
RP149498
55.498
In terms of the extended length of Elkhorn Drive, the Noosa Plan Reconfiguring a Lot Code (Part 14 Division 23)
states that the maximum length of a cul-de-sac should be 200m. Furthermore, the Transport, Roads and
Drainage Code (Part 14 Division 18) specifies a maximum cul-de-sac length of 120m. The latter is based on
guidance from Queensland Streets', which specifies the relationship between street leg length and street speed. A
street leg length of 120m relates to a design speed of 40km/hr.
However, in addition to limiting the total length of a street, Queensland Streets identifies other measures to limit
speed by means of street design geometry as follows:
— limiting the length of straight (by introducing sharp bends in the street layout)
— curved alignment (either a single curve or a series of curves)
— control devices (in an otherwise straight alignment)
Given the straight alignment of Elkhorn Drive, the only measure available is to utilise speed control devices.
There are currently no speed control devices on the existing section of Elkhorn Drive, despite its length of
around 250m. However, it is recommended that one speed control device (eg a speed hump) be installed on the
new extension of Elkhorn Drive to maintain a 40km/hr design speed in this section. This should be installed
where the new section meets the existing Elkhorn Drive carriageway as shown in Figure 3.
' Institute of Municipal Engineering Australia (2003) Queensland Streets: Design Guidelines for Subdivisional Streetworks
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PEKOL TRAFFIC & TRANSPORT
Figure 3: RECOMMENDED SPEED CONTROL DEVICE
NEW SECTION OF
: c ELKHORN DRIVE
ec > $ \
SPEED:CONTROL
DEVIGE 10 “re
< EXISTING ELKHORN
DRIVE CARRIAGEWAY
1 11 |
| fet |
XG
Based on the above, it is our view that the proposed residential subdivision provides an improved arrangement
over the existing situation in terms of accessibility and would have a negligible impact on safety, amenity and
convenience. If you have any questions regarding this matter then please do not hesitate to contact us.
Yours sincerely,
Adam Pekol
Director (RPEQ 5286)\
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