Motorists are being reminded of lane closures on the Auckland Harbour Bridge as its annual maintenance gets underway.

The northbound clip-on will be closed for a fortnight while the two lanes can be resurfaced.

The Curran Street on-ramp, which feeds northbound traffic onto the clip-on, and the Stafford Street off-ramp on the North Shore will also be closed.

Six other traffic lanes on the harbour bridge will remain open during the work - three in each direction.

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The NZ Transport Agency expects to have the work completed by January 6.