Traffic Engineering Report

Table 7.1: Summary of Sidra Outputs (Myall Street/Holts Road Intersection)

 Case                              Degree of    Highest/   Highest    95th Percentile Critical Queue (m)
                                   Saturation   Average    Level of
                                                                      South     East        North   West
                                                Delay      Service
 2009 AM Base Case                 14.7%        8.2/0.5    A          0.4      0.1      -           0.1
 2019 AM Base Case                 19.6%        11.4/1.8   B          2.0      2.0      -           0.9
 2019 AM Project Case              36.8%        13.7/4.7   B          13.4     3.7      -           2.8
 2029 AM Base Case                 26.0%        14.3/1.6   B          2.6      2.0      -           1.0
 2029 AM Project Case              47.2%        18.6/4.8   C          18.1     3.7      -           2.9
 2009 PM Base Case                 19.5%        9.3/0.5    A          0.8      0.2      -           0.0
 2019 PM Base Case                 27.6%        14.1/2.5   B          8.8      0.7      -           0.2
 2019 PM Project Case              58.9%        18.3/6.0   C          28.8     2.3      -           2.1
 2029 PM Base Case                 39.6%        21.2/2.8   C          13.5     0.7      -           0.2
 2029 PM Project Case              83.5%        36.9/9.1   E          55.8     2.3      -           2.2



Table 7.1 shows that the Myall Street/Holts Road intersection will operate suitably in the
design horizon with acceptable delays and level of service. The Degree of Saturation (DOS) is
expected to exceed 83.5% in the 2029 PM Project Case. Given the level of conservative
estimations to determine future traffic volumes (particularly the chosen base volumes and
growth rates) the DOS is unlikely to reach this high solely due to the proposed development.

TTM have tested a further intersection option which included a 20m left turn lane from Holts
Road as shown in Figure 7.2.




Figure 7.2: Myall Street/Holts Road Layout With 20m Left Turn Lane
With this short turn lane the DOS reduces to 79.4% with lower delays and queuing on the Holts
Road approach. If road authorities require an upgrade to this intersection, it should be limited



Site: Lot 3 Taylor Court, Cooroy                                                                     20
Reference: 16BRT0201