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Auckland Transport

Dairy Flat Highway safety improvement project updates Dairy Flat Highway safety improvement project updates


1 October

Construction of the new Dairy Flat Highway/Coatesville-Riverhead Highway intersection roundabout is well under way now, along with other improvements in the area including safety barriers.
Over the coming weeks Kahikatea Road intersection improvements will start, which will also include threshold treatments which is the red surfacing applied to roads to let drivers know there is a change in road environment.

Dairy Flat Highway/Coatesville-Riverhead Highway roundabout

Three retaining walls are currently in different stages of construction, and stormwater work has started with the installation of pipes and manholes where one of the rain gardens will be installed. There have been some delays to construction due to lizard protection requirements. As part of the resource consent requirements for this project, when we carry out vegetation clearance work we need to have a herpetologist on site to recognise and relocate any protected lizards found. The cooler weather has also meant they have not been able to do this since lizards are not active during cold weather. To date, no protected lizards have been found.

Workers working on one of the retaining walls
One of the new retaining walls that will help to accommodate the new roundabout.


17 August

Temporary speed limit reduction at Dairy Flat Highway and Coatesville-Riverhead Highway intersection

Auckland Transport is working on a number of safety improvements for Dairy Flat Highway, part of these safety improvements includes a speed reduction from 80km/h to 60km/h at the Dairy Flat Highway and Coatesville-Riverhead Highway intersection. There are also new flexi posts and additional speed limit signage in place.

Dairy Flat Highway map speed reduction

The reduced speed limit was implemented in early July 2018, and the speed limit will remain at 60km/h until construction starts on the wider safety improvements in the 2018/2019 summer.