The timeline for repairing a large slip on State Highway 4 between Whanganui and Raetihi is stretching out.
The slip, between Otoko Pā and Kakatahi School, was caused by a storm.
In order to repair it contractors need to re-open a 300m earlier stretch of SH4, downhill from the current highway, NZ Transport Agency systems manager Ross l'Anson said.
Re-opening that requires consent from both Horizons Regional Council and Whanganui District Council, because the work involves moving earth and will be in or near waterways.
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Once that old stretch of road is re-opened the repair above should take six to eight weeks, though weather could cause a delay.
The repair might also take longer if bank stability is less than expected once the slip is cleared.