State Highway 1 between the Orewa interchange and Silverdale interchange will close southbound overnight on Sunday, February 1.

NZTA says the full southbound closure is for general maintenance, running between 9pm and 5am.

The Orewa (Grand Drive) southbound on-ramp, Millwater (Wainui Road) southbound on-ramp, and the Silverdale southbound off-ramp will also be closed, with signposted detours in place.

For Hibiscus Coast drivers heading south late Sunday night, this means a longer trip and changed access from Orewa, Millwater, and Silverdale.

NZTA notes ramp closures and lane restrictions may start before the advertised mainline closure times.

NZTA’s recommended detour for light vehicles is via Grand Drive, West Hoe Road, Florence Ave, Centreway Road, and Twin Coast Discovery Highway to the Silverdale southbound on-ramp.

Vehicles over 3.5 tonnes will not be able to use Grand Drive during the closure and must exit at Pohuehue Road, Warkworth, then take Old SH1 to Twin Coast Discovery Highway.

On Monday, February 2 and Tuesday, February 3, NZTA says there will be southbound lane restrictions between the Silverdale interchange and Oteha Valley Road, from 9pm to 5am, for safety improvement works near the southbound lanes.

Traffic will be able to travel south at all times, with drivers asked to slow down and follow traffic management instructions.

NZTA also advises a separate SH1 O Mahurangi Penlink project closure, with a full northbound closure between Oteha Valley Road and Silverdale interchange from Sunday, February 1 to Wednesday, February 4, between 9pm and 5am.

This work is weather dependent and NZTA says dates may change.

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