Response to Information Request 10-6-2025 Traffic impact assessment · OPW25/0042

The results of the SIDRA analysis for the 2025 Base + Earthworks scenarios (both weekdays and weekends)
are summarised in Table 3-3. Detailed SIDRA output data is also included in Attachment C – SIDRA Outputs.

Table 3-3: Summary of Sidra Outputs (Grant Street / Banksia Avenue Roundabout)

 Scenario           DOS          Average Delay                            LOS                  95th Percentile Critical Queue
                                                                                               (m)
                                 Overall      Worst Movement              Overall   Worst      Banksia    Grant      Banksia
                                                                                    Movement   Ave (S)    Street     Ave (N)
                                                                                                          (E)
 Weekday - AM Peak Hour

 2022 Survey           5%          6 sec       9 sec (UT Banksia Ave N)      A         A        <1m         1m         2m
 2025 Base             5%          6 sec       9 sec (UT Banksia Ave N)      A         A        <1m         2m         2m
 2025 Base +           5%          7 sec       9 sec (UT Banksia Ave N)      A         A        <1m         2m         2m
 Earthworks
 Weekday - PM Peak Hour

 2022 Survey           4%          7 sec         9 sec (UT Grant St N)       A         A        <1m         2m         1m
 2025 Base             4%          7 sec         9 sec (UT Grant St N)       A         A        <1m         2m         2m
 2025 Base +           5%          7 sec         9 sec (UT Grant St N)       A         A        <1m         2m         2m
 Earthworks
 Weekend – PM Peak
 2022 Survey           4%          7 sec       9 sec (UT Banksia Ave N)      A         A        <1m         2m         2m
 2025 Base             5%          7 sec       9 sec (UT Banksia Ave N)      A         A        <1m         2m         2m
 2025 Base +           5%          7 sec       9 sec (UT Banksia Ave N)      A         A        <1m         2m         2m
 Earthworks
RT – Right Turn Movement, Th – Through Movement, LT – Left Turn Movement, UT – U Turn Movement; N – North, S – South, E –
East, W – West


The analysis indicates that the roundabout is expected to operate at suitable levels at the 2025 assessment
year, with Earthworks traffic included, with a worst-case DOS 5% (less than 85%, practical capacity limit of
roundabout) and an overall LOS A. The addition of the earthworks traffic has negligible impact to key
operational metrics, with no significant change to average intersection delay and queuing.

Based on this assessment, the Earthworks traffic is considered to have no adverse impact on the operations
of this roundabout.




Site: 3-7 Serenity Close, Noosa – Proposed Resort Complex
Reference: 22BRT0122