Traffic response · MCU18/0019

In light of the above, the predicted trip generation during the commuter peak periods on the road network
(typically 8 – 9am and 5 – 6pm) is expected to be very low, given that staff changeover does not coincide
with these periods.
This is consistent with the (conservatively high) traffic generation forecasts in the Traffic Report which
accompanied the development application, which were based upon the trip generation rate recommended in
the RTA Guide to Traffic Generating Developments. This document suggests a rate of 0.1 - 0.2 trips per
dwelling in the evening peak hour, for housing for aged and disabled persons. Appendix 3A in TMR’s Road
Planning and Design Manual suggests that this rate is appropriate for retirement / ages homes.
It is acknowledged that this trip generation rate relates to ‘dwellings’ (e.g. independent living units) rather
than beds. However in the absence of published trip generation rates on a ‘per bed’ basis, the rate at the
higher end of the range has been applied to the proposed development (i.e. 90 beds x 0.2 trips per bed). This
is considered to be a reasonable assumption given that the staffing requirements for an aged care facility (as
opposed to independent living units) are higher, but the traffic volumes generated by visitors are likely to be
lower, and the traffic volumes generated by residents will be negligible.
The application of this trip generation rate (i.e. 0.2 trips per bed) to the 90 beds proposed suggested a peak
hour traffic generation of 18 vehicle trips in the peak hours, or one (1) vehicle trip per 3 – 4 minutes on
average, during the critical peak hours. Whilst this is considered to be a conservatively high estimate of the
site traffic generation during the road peak periods given that staff changeover does not coincide with these
periods, this level of traffic generation is clearly very low, and likely to be well within the typical
fluctuations in background traffic volumes on the local road network, therefore negligible from a traffic
engineering and transport planning perspective.
Furthermore, this does not take into consideration the existing uses (i.e. nine (9) residential dwellings) on
the subject site. These dwellings would currently generate in the order of 7 – 8 vehicle trips in the critical
peak hours (assuming 0.85 trips per dwelling as recommended in the RTA Guide to Traffic Generating
Developments), therefore the net impact of the proposal would be only 10 – 11 additional vehicle trips in
the peak hours, or one (1) additional vehicle trip per 5 – 6 minutes on average, during the critical peak hour.
This level of additional traffic generation during the road network commuter peak periods is clearly very
low. As a consequence, no external roadworks are required to support the proposal, and any impacts
(however minor) would be mitigated by way of infrastructure contributions payable as part of the
redevelopment of the site.
Issue –Val Crescent Driveway Levels
The proposed RL of 4.372 on the property line at the Val Crescent driveway does not appear to match
with the existing 5.0m and 4.5m contours either side of the driveway.
Information requested
9. Please provide section plans of the proposed Val Crescent driveway demonstrating how the driveway
satisfactorily interacts with the existing kerb level, complies with the relevant Australian Standards and
the pedestrian sight splay recommended in the QTraffic report.
Response
The drawings included in Attachment 1 include sections along the eastern and western sides of the
driveway, and the updated ground floor plan shows a minimum 2.5m x 2.0m sight triangle adjacent to the
exit side of the driveway, as required under the provisions of AS2890.1.
The sections included in Attachment 1 indicate that the verge along the northern frontage of the site will
need to be regraded in the vicinity of the driveway, in order to achieve the proposed driveway levels. This
regrading, which it is anticipated would be undertaken in conjunction with frontage works on Val Crescent,
would reduce the gradient across the verge to approximately 1:40 - 1:24 along the western and eastern sides
of the driveway respectively.



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Our Ref: 290_KNG01                                                                                 2 May 2018