Appendix E- Traffic Impact Statement · MCU23/0078

 Stockwell Development Group Pty Ltd                                              SLR Ref No: 620.30926-R01-v1.0 TIA 20230524.docx
 Traffic Impact Assessment                                                                                               May 2023
 Proposed Noosa Civic Village Mixed Use Development




Table 12 External Traffic Distribution
                                                                                                                  Provided
      Direction        Description
                                                                                                                 Percentages
      North
                       To/from the south-west and west of the broader external road network utilising
    (Hofmann                                                                                                          30%
                       Hofmann Drive to access/egress the site.
      Drive)
     North
                       To/from the north, far north, east and far east of the broader external road
   (Walter Hay                                                                                                        45%
                       network utilising Walter Hay Drive to access/egress the site.
     Drive)
  South (Walter
                       To/from the south utilising Walter Hay Drive to access/egress the site.                        25%
   Hay Drive)
                                                                                                      Total          100%


8.7        Assessment Software
The study intersections were analysed for each of the aforementioned scenarios using SIDRA Intersection 9
software (SIDRA). SIDRA is an industry recognised analysis tool used to estimate the capacity and operational
performance of intersections based on a variety of input parameters including geometrical data and traffic
volumes. SIDRA provides an estimate of an intersection’s operation by reporting a number of numerical outputs
including Degree of Saturation (DOS), queues and delays.

8.8        Performance Criteria
8.8.1      Intersection Performance Thresholds

DOS thresholds, as defined in Guidelines for Assessment of Road Impacts of Development (GARID) 2006, have
been used to understand the operational performance of an intersection. Whilst it is noted that these thresholds
are no longer adopted by the GTIA, these parameters are still considered to be relevant and appropriate for
assessing the capacity and performance of an intersection, particularly when assessing its operational
performance under existing conditions. The DOS thresholds, as defined by the GARID, are presented in Table 13
below.

Table 13 DTMR GARID Intersection Performance Thresholds
 Intersection Type                                                                     DOS Threshold
 Signalised intersections                                                         Less than or equal to 0.90
 Roundabouts                                                                      Less than or equal to 0.85
 Priority controlled intersections                                                Less than or equal to 0.80

DOS values exceeding the thresholds presented in Table 13 indicate that the intersection is nearing its practical
capacity, and therefore, road users are likely to experience rapidly increasing delays and queuing. Mitigation
works may be required to maintain satisfactory operation at such a point.




                                                            Page 32