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Flagstaff Road Upgrade Project - Temporary traffic arrangements on Flagstaff Road

Tuesday, 15 June 2021

A number of temporary closures and restrictions will be required from Sunday, 20 June on Flagstaff Road, between Hyland Avenue and Bonneyview Road, as part of the Flagstaff Road Upgrade Project.

The project involves the installation of a fourth lane on the above section of Flagstaff Road to make it a permanent two-way dual carriageway. The South Australian Government has committed $32.9 million towards the Flagstaff Road Upgrade Project, which will support approximately 40 full-time equivalent jobs per year.

Currently, the 800 metre section of Flagstaff Road between Hyland Avenue and Bonneyview Road consists of three lanes, with flow on the centre lane reversed daily to cope with peak-hour traffic in the mornings and evenings. This reversal of traffic flow is a potential cause of confusion for motorists and remains a safety concern.

Flagstaff Road is a major arterial road used by approximately 21,000 motorists every day. When complete, the project will reduce traffic congestion on the busy road, make navigation of the road easier and improve safety for motorists.

Temporary road closures/restrictions from Sunday, 20 June

The following temporary closures or restrictions will apply to Flagstaff Road, between Hyland Avenue and Bonneyview Road:

  • The road will be temporarily closed from 8pm Sunday, 20 June to 5.30am Monday, 21 June to implement a traffic switch to temporarily change traffic arrangements as part of the project. Detours will be in place. Local access and bus access will be maintained.
  • The changed traffic arrangements will result in the southbound lane and bike lane on Flagstaff Road, between Hyland Avenue and Bonneyview Road, being temporarily closed with the two remaining lanes open to allow two-way traffic to be maintained on Flagstaff Road (one lane in each direction) between Hyland Avenue and Bonneyview Road until late 2021.
  • To facilitate night works, the road will also be temporarily closed from 8pm to 5:30am each Sunday to Thursday commencing Monday, 21 June and continuing until Thursday, 15 July, weather permitting. Detours will be in place. The road will re-open at 5:30 am each morning. No work will be undertaken on Friday or Saturday nights. Local access will be maintained via detours during the night works.

Traffic management and signage will be in place to alert road users to changed traffic conditions.

Road users are asked to plan ahead, observe signage, speed limits and the direction of traffic controllers, and to take extra care when travelling through the area.

Pedestrians and cyclists

There will be temporary access changes for pedestrians and cyclists during the works until late 2021. Pedestrians and cyclists are encouraged to use the detours in place and take care when travelling in the area.

Changes to bus services

The works will require changes to night bus services from Sunday, 27 June to Thursday, 1 July, affecting G20, G21 and 320 services. For more information visit

Community information sessions

Drop-in community information sessions are being held at the Flagstaff Hill Golf Club, Memford Way, Flagstaff Hill, on Wednesday 16 June (4pm to 7pm) and Saturday 19 June (10am to 12pm).

To attend the community information sessions, register at or call 1300 059 639.

More information

For more information about the project visit

The Department for Infrastructure and Transport appreciates your cooperation and patience while these important works are undertaken.