From Wednesday 26 August – Sunday 18 October, safety upgrades will be taking place on the Northern Gateway toll road between Ōrewa and Johnstone’s Hill Tunnels following the speed limit change from 100 km/hr to 110km/hr.

The work will involve the installation of new side barriers, maintenance bays and drainage improvements.

The Northern Gateway is a critical link between Northland and Auckland and while these safety upgrades are essential, we are committed to reducing the disruption for motorists.

To keep traffic moving, works have been scheduled in northbound and southbound stages, with single-lane restrictions in place so people can continue to access State Highway 1 (except during the full night-time closures).

The two-staged programme is as follows: Northbound stage - Wed 26 Aug – Tue 15 Sep

Wed 26: Aug One-night only 9pm-5am Full northbound closure - Detour: Old SH1 between Silverdale and Warkworth. Thu 27 Aug – Tue 15 Sep: 24/7. Single-lane restrictions. Tue 15 Sep: One night only 9pm-5am. Full northbound closure (coinciding with general maintenance closures) detour - Old SH1 between Silverdale and Warkworth

Southbound Stage – Wed 16 Sep – Sun 18 Oct: Wed 16 Sep One-night only 9pm-5am Full southbound closure (coinciding with general maintenance closures) Detour - Old SH1 Warkworth and Silverdale. Thu 17 Sep – Sun 18 Oct: 24/7. Single-lane restrictions. Sun 18 Oct: One night only. 9pm-5am. Full southbound closure. Detour - Old SH1 Warkworth and Silverdale.

When night-time full closures are in place, detours are via the old SH1 between Silverdale and Warkworth. This is because the Ōrewa interchange is not suitable for heavy vehicles unable to use Grand Drive due to weight restrictions.

Our team will be working behind temporary barriers with reduced speed limits in place for safety. Please drive with care when passing the worksite.

To minimise future disruptions, we will be carrying out other projects including vegetation control, drainage improvements and the construction of a new maintenance bay as part of the work. This work is weather dependent and may change from advertised dates.