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House of Assembly - Fifty-Fifth Parliament, First Session (55-1)
2022-11-29 Daily Xml
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Auditor-General's Report

In reply to Mr PEDERICK (Hammond) (3 November 2022).

The Hon. G.G. BROCK (Stuart—Minister for Local Government, Minister for Regional Roads, Minister for Veterans Affairs):

1. The investment options discussed in the Report of the Auditor-General, Report 8 of 2022, Part C: Agency audit reports have been considered for managing the growing road pavement backlog in the regional road network for the next four years. These options aim to reduce or eliminate the growth in road pavement backlog to 2025. Continued investment into road renewals will be required beyond 2025, to address future road pavement deterioration as road quality and maintenance condition deteriorate over time.

2. The Department for Infrastructure and Transport (the department) continually reviews and recalculates the road pavement backlog and reassesses various treatment strategies. During 2021-22 financial year, the department forecasted the following potential treatment types to address the predicted regional roads pavement backlog.

Descriptions Length (kilometres) Percentage
Road Surface Sealing Treatments
Treatments will consist of either:A Single Spray Seal (a single layer of bitumen sprayed as a hot liquid with a single layer of aggregate (gravel) applied) orA Double Spray Seal (A single seal applied then another layer of bitumen is sprayed with a smaller aggregate applied over the top) 420 17%
Road Pavement Renewal Treatments
Granular Overlay (additional material added over the existing pavement) 1500 65%
Asphalt Overlay various thicknesses 400 17%
Pavement Stabilisation 10 1%
TOTAL 2330 100%


3. It is important to note that with the current wet climate conditions being experienced in 2022, there will be a change in the rate of deterioration of the road pavement and as such the Department will recalculate the road pavement backlog.

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