07/2398 - Request for information response [As Published] · 132007.2398

 

 

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2.0 Response

The submitted traffic report’ undertaken by McCormick Rankin Cagney (MRC) assessed the
impact that the proposed development would have on the external road network, which
included the intersection of Diamond Street and Elm Street, during the AM and PM peak hour
periods up to the design horizon year of 2020.

The 2010 and 2020 traffic volumes were determined from factoring 2007 survey data by a 3%
pa compound growth rate. Intersection analysis software SIDRA3.2 was used to determine
what additional impact the proposed development would have on the operation of the Elm
Street / Diamond Street intersection during the AM and PM road peak periods.

Figure 4 of the initial traffic report (Ref 1) illustrated the layout of the existing intersection and is
replicated below.

 

 

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Figure 1. Existing Eim Street / Diamond Street intersection

The performance criterion upon which performance intersections is assessed is defined in
Section 6.4.1 - Limits of acceptable operation of the Department of Main Roads document?
which states:

‘Priority junctions — the Degree of Saturation for any movement should not exceed 0.80
\ > Queue lengths — the 95%ile confidence limit should generally be used for queue fengthse ImN

80

' Cooroy Retirement Community, 19 Trading Post Road, Traffic impact Assessment, 14 July 2008. McCormick Rankin
Cagney.

? Guidelines for Assessment of Road impacts of Development, 1 April,2006, Queensland Department of Main Roads,

 

9427-002(1) - AFl.doc

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