Attachment 5 - Traffic Impact Assessment Final PTT · 132005.638.06

         The 95th percentile queues at the weighbridges have been calculated using the methodology
         detailed in Section 2.6. The following assumptions related to the post-development scenario
         (detailed in Section 4.2) include:

         —        peak arrival rates:

                  —       Tuesday:       107vph
                  —       Sunday:        99vph

         —        approximately 55% of inbound traffic would travel south to the existing weighbridge or to
                  the other on-site facilities

         —        approximately 45% of inbound traffic would travel east to access the proposed
                  weighbridge

         The 95th percentile queues from each weighbridge and for each peak hour scenario are
         summarised in Table 3.1.

         Table 3.1:            95TH PERCENTILE QUEUES
                                                   EXISTING WEIGHBRIDGE                     PROPOSED WEIGHBRIDGE
           Arrival Rate (vph)
           —       Tuesday Peak Hour                                59                                      48
           —       Sunday Peak Hour                                 55                                      45

           Available Queuing (m)                                    90                                     140

           95th Percentile Queues
           —       Tuesday Peak Hour                          4 veh (40m)                               3 veh (30m)
           —       Sunday Peak Hour                           3 veh (28m)                               3 veh (28m)


         As shown, there is sufficient queuing from both weighbridges to accommodate the expected 95 th
         percentile queues, based on a 45:55 share of incoming traffic.

         3.4.2        Sensitivity Analysis
         A sensitivity analysis has been undertaken to determine the arrival rates that would result in
         unacceptable queuing on-site. The critical weighbridge is the existing one as it has less queuing
         space (ie 90m) and receives a higher proportion of inbound traffic (ie 55%).

         Based on the assumptions above, if arrival rates exceed 170vph (ie 94vph to the existing
         weighbridge), the queue would extend to the internal intersection. This would obstruct access to
         the proposed weighbridge, which could then result in queues extending out onto the external
         road network (ie unacceptable queuing).

3.5      PARKING
         As discussed in Section 3.1, the proposed expansion would be supported by an additional five
         full time staff. For utility installations (ie waste management services), Council’s Planning Scheme
         requires that sufficient parking be provided for the intended use. As such, it is recommended that
         an additional five staff parking spaces be provided.




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