Repairs to drainage and road surfaces across Northland's state highway network may cause delays for motorists over the next five weeks.

The NZ Transport Agency is starting major repairs to improve road surfaces and drainage on state highways across Northland, with some of the repairs expected to take up to five weeks to carry out.

NZTA Northland Highway Manager Brett Gliddon said the work could cause delays of up to five minutes at each site, so road users are advised to plan ahead and allow extra time for their journeys.

Mr Gliddon said the NZTA has planned the works to minimise travel delays.

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"Improving drainage protects the road from damage from things such as potholes, slips and erosion which makes travelling on the highway smoother and also reduces the need for ongoing maintenance which is costly and can be disruptive for road users," he said.

Work is already under way on State Highway One through the Awanui township. Drainage clearing is expected to take three weeks before road surface repairs are carried out. There will be a single lane closure throughout the work.

"The work is part of NZTA's ongoing commitment to maintaining the reliability and safety of Northland's highways for all road users and we thank drivers for being patient while we carry out these improvements."

Other work is planed for: SH1 Brynderwyns - just south of Waipu Gorge Rd; SH1, Western Hills Dr; SH12, Parore Rd; SH12, Whakapirau; SH1, north of Okaihau; SH1, Awanui and SH1, Mangamuka.

Check the Transport Agency's website: www.nzta.govt.nz for the latest highway information or sign up to www.onthemove.govt.nz for up-to-date information on what is happening on the route you plan to travel.