Appendix C - Traffic + Carparking - 6-10 Diamond Street Cooroy - 21.12.18

4.2          Development Traffic Generation
This is a relatively small‐scale development, which is not covered by recent information collated in the
Department of Transport and Main Roads’ ‘Traffic Generation Data – 2006 – 2017 (Queensland) Open
Data’. As such, reference has been made to the ‘Guide to Traffic Generating Development’ document,
issued by the Roads and Traffic Authority New South Wales. Reference to this document indicates that the
following peak hour trip generation rates are appropriate:
          Shopping Centre:
           - Convenience Shop Component:                     15.5 trips / 100sq.m / hour in the peak hour.
           - Office Component:                               2.2 trips / 100sq.m / hour in the peak hour.
          Residential:                                      0.85 trips / unit / hour in the peak hour.
Application of the above rates to the proposed development anticipates peak hour traffic generation for
the proposed uses as per Table 4.1.

Table 4.1: Trip Generation
      Use               Size                    Trip Generation Rate               Trip Generation (Volume)
     Shop              380sq.m                 15.5 trips / 100sq.m / hr                    58.9 trips / hr
    Office             317sq.m                 2.2 trips / 100sq.m / hr                     7.0 trips / hr
 Residential           4 units                   0.85 trips / unit / hr                     3.4 trips / hr
                                                                          Total             69.3 trips / hr
The proposed development is therefore expected to result in a peak hour traffic generation of 70 trips.
Of relevance to this Application, however, is the convenience nature of the proposed Shop component. It is
anticipated that this component will have an element of drop in traffic. Reference to Appendix F of DTMR’s
GARID document indicates that for Shopping Centres of this size, some 18% of traffic is Undiverted Drop‐In
traffic. Applying this to the Shop component of the development anticipates 10 Undiverted Drop‐In trips
(5 in / 5 out) and 60 New or Link‐Diverted trips.
To determine site generated directional movements, the assumption in Table 4.2 have been adopted.

Table 4.2: In / Out Traffic Split
                                                AM Peak Hour                                  PM Peak Hour
            Use
                                          In                     Out                   In                     Out
           Shop                      70%                         30%                  50%                     50%
           Office                    90%                         10%                  10%                     90%
         Residential                 30%                         70%                  70%                     30%




www.bmctraffic.com.au                                                                                               7
BMC18169: 6 – 10 Diamond Street, Cooroy
6 December 2018