A major safety upgrade to State Highway 2 between Tauranga and Waihi will be underway in the next four months.

New Zealand Transport Agency said motorists travelling on SH2 between Tauranga and Waihi should drive with extra care in the next four months as work gets underway on a major safety upgrade.

A section of highway between Wainui South Rd and Sargent Dr will be repaired and widened, and a wire rope central median barrier installed to prevent head on crashes.

Work starts this month and is expected to wrap up in early May.

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People should only expect minor delays minor delays but were urged to stay alert behind the wheel as there would be significant changes including lane closures, speed restrictions and occasional stop/go traffic management.