Attachment 9 - Traffic Engineering Report

7            Road Network Performance
7.1 Myall Street / Site Access Assessment
7.1.1        Turn Lane Warrant Analysis
A turn lane warrant analysis has been undertaken in accordance with DTMR’s Supplement to Austroads
Guide to Road Design Part 4A: Unsignalised and Signalised Intersection (Aug 2014) to determine if turn
treatment upgrades are required as a result of the proposed development.

Table 7.1 details the parameters and turn lane treatment types required at the proposed development site
access based on the estimated 2034 peak hour traffic volumes.

Table 7.1: Turn Lane Warrant Assessment – Myall Street / Site Access Intersection
 Approach                    Scenario           AM Peak Hour                        PM Peak Hour
                                                Q R/L    QM           Treatment     Q R/L   QM     Treatment
 Right Turn-in               2034 Project       18       1335         CHR(s)        6       1116   CHR(s)
 Left Turn-in                2034 Project       72       671          AUL / CHL     33      534    AUL (s)

The assessment indicates that the proposed development site access requires a channelised right turn lane
treatment (CHR(s)) and a channelised or auxiliary left turn lane treatment (AUL / CHL). A preliminary review
indicates that the required treatments can be accommodated within the existing road reserve.

7.1.2        SIDRA Analysis
The required access intersection configuration has been analysed for the 2024 and 2034 traffic volume
scenario. Figure 7.1 shows the modelled intersection configuration with the proposed turn treatments.




Figure 7.1: Proposed Myall Street / Site Access Intersection Layout


Site: Lot 2 & 3 Myall Street, Cooroy                                                                           24
Reference: 19BRT0357