Traffic Engineering Report

to this 20m left turn lane on Holts Road and should be provided by others i.e. applicants of the
industrial lots.

It is noted that the several assumptions were used to determine future based traffic and traffic
distributions. It is therefore recommended this intersection be reassessed within 1 year of the
opening day of the development to determine if any intersection upgrades are required.

7.1.2.         Turn Treatments
The State requirements for turn treatment warrants are now aligned with the Austroads
Guidelines. Therefore, it is the Austroads Guide to Road Design (Part 4A), which has been
utilised to address the warrants for turn treatments.

The assessment has been undertaken for the 2029 design year, based on the development
case volumes shown in Appendix D. These volumes are plotted in Figure 7.3, which is a
reproduction of Figure 4.9(a) of the Austroads Guidelines. This figure is used for determining
the warrants of turn treatments for roads less than 100km/h design speed.



                                                                   Left Turn

                                                                   Right Turn




Figure 7.3: Myall Street/Holts Road Turn Warrant Analysis



Figure 7.3 identifies that this intersection requires a short auxiliary turn lane, AUL(S) and a
chanellised right turn lane (CHR). The intersection is considered to be in an urban environment
with a design speed of 70kph (posted 60kph speed limit).

The AUL(S) treatment should therefore be 35m long including a taper. This intersection design
currently includes a 65m left slip lane, excluding taper, which is considered suitable.



Site: Lot 3 Taylor Court, Cooroy                                                             21
Reference: 16BRT0201