Heavy machinery is cutting banks along the Brynderwyn Hills as work on $16 million of safety improvement cranks into top gear.
Temporary speed signs of 50km/h have been put in place and cones are littered on the northern side of the hill as United Civil start preparatory work which includes road widening and a median wire rope barrier installed to separate north and south-bound traffic.
The south-bound passing lane on the north of the hill is down to one lane to enable the roadworks to be done.
New Zealand Transport Agency began the work in early December and should have the entire project completed by November 2016.
The highway would remain open to two-lane traffic throughout the project and there should be no need for detours as the contractors would be able to use the passing lane to maintain two lanes of traffic while they complete the work.