2+1 Rural Highway Treatments in Queensland, Australia

Bartolo, Jack (2017) 2+1 Rural Highway Treatments in Queensland, Australia. [USQ Project]

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Two-lane highways in rural Australia perform an important task of conveying traffic across long distances. Some sections of rural two-lane highway are under ever increasing strain due to increasing traffic demand. Not all two-lane highways can be upgraded to a four lane carriageway due to cost.

The conventional way of optimising a two-lane highway in Australia is ensuring that there is a desirable amount of overtaking opportunities on the section of road. However, on some sections of road the traffic exceeds the capacity of the road but doesn’t warrant the implementation of duplication.

The 2 plus 1 (2+1) treatment can be used on the busier sections of road that contain large percentages of heavy or slow vehicles. This treatment is essentially providing continual overtaking lanes in both directions. The use of a 2+1 treatment has generally been used in Europe to improve safety, but little research reported the traffic performance improvements or disadvantages.

A literature review was performed including the compilation of existing literature on 2+1 treatments to provide insight into how the treatment was implemented differently in each case. A concept design & strategy on a typical section of road was created. Analysis in HCS2010, which is endorsed by the Transportation Research Board (2010a), was then performed to find the existing segment of road performance and then the 2+1 treatment was analysed to find the improvement in performance over the section of road.

From research it was obvious that no case study had implemented the 2+1 treatment the same. No guideline for this treatment has been detailed. The 2+1 treatment is an effective alternative to duplication.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) (Civil)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Drysdale, Trevor; Barrie, Andrew
Date Deposited: 07 Sep 2022 04:07
Last Modified: 07 Sep 2022 04:07
Uncontrolled Keywords: Two-lane highways; rural Australia; 2 plus 1 (2+1) treatment
URI: http://sear.unisq.edu.au/id/eprint/40856

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