MCU14/0106 Appendix D - Traffic Impact Assessment

                                                                                            Traffic Impact Assessment
                                                                                               Noosa Civic Expansion



5.6.4          Intersection 4: Eumundi-Noosa Road/Eenie Creek Road/Eumundi Road
The intersection of Eumundi-Noosa Road/Eenie Creek Road/Eumundi Road is currently a four-way
roundabout with varying circulating lane widths, under the authority of the Noosa Council. The intersection is
a major intersection catering for three high order roads, being Eumundi-Noosa Road, Eumundi Road and
Eenie Creek Road. Eumundi-Noosa Road forms the western leg of the intersection, with Eumundi Road
forming the northern leg and Eenie Creek Road along the eastern leg of the intersection. Commerce Court
forms the southern leg of the intersection and solely provides access to properties located south of the
intersection. The most recent aerial imagery of the intersection is shown alongside the analysed intersection
form on Figure 5-7. Results for the analysis are summarised in Table 5-9.

Figure 5-7 Intersection 4: Eumundi-Noosa Road/Eenie Creek Road/Eumundi Road




Source: Aerial image supplied by Nearmap, maps.au.nearmap.com

Table 5-9      Intersection 4: SIDRA Results – Existing Layout
                                          Thursday PM Peak Hour                    Saturday AM Peak Hour
Scenario
                                                                 95th%le                                 95th%le
                                  DOS          Delay (sec)                  DOS         Delay (sec)
                                                                Queue (m)                               Queue (m)

2014 Background                    0.51             8                 35    0.61            8               39

2018 Background                    0.61             9                 53    0.73            12              84

2018 with Development              0.71            11                 77    0.93            24             218

2028 Background                    0.79            13                 106   1.02            43             451

2028 with Development              0.93            23                 229   1.32           174             1747

The results indicate that the existing intersection has adequate capacity for the background scenario at the
2018 design horizon. For the development scenario at the 2018 design horizon the intersection would fail to
operate acceptably during the Saturday AM design period with the new development traffic volumes
introduced in 2018.
Irrespective of the development traffic, the intersection does not have adequate capacity for the background
scenario at the 2028 design horizon as it breaches the DOS threshold of 0.85 for roundabouts. Capacity
failure of the existing roundabout would occur at approximately 2022 irrespective of the development traffic.
To obtain an acceptable level of operation at the 2028 design horizon without the development, an upgrade
of the roundabout is required. The analysis indicates that a roundabout would not provide adequate capacity

J13041                                                       Cardno                                   December 2014
Prepared for QIC Noosa Civic Pty Ltd                                                                       Page 26