State Highway 1 south of Kaikoura has reopened this morning, after a slip yesterday closed the quake-damaged road.

Christchurch Transport Operations Centre spokesman Luke Thomas confirmed just before 9.30am that the slip between Peketa and Goose Bay had been cleared and the road reopened.

Kaikoura was cut off for several weeks after November's 7.8 magnitude earthquake, which walloped central New Zealand and triggered a series of huge slips on SH1 between Picton and Christchurch.

The inland road, via Waiau, is open 24 hours a day and SH1 south of Kaikoura reopened to daytime traffic last month.

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However, SH1 north of Kaikoura has been closed between Mangamaunu and Waipapa Bay since the quake.

Repairs to SH1 and the adjacent rail line on the coast north and south of Kaikoura are expected to cost up to $2 billion.