The Education Secretary has re-iterated the decision to shut schools is about managing traffic to get infrastructure up and running.

The Education Ministry previously said education services couldn't open for on-site instruction until after Waitangi weekend.

Education Secretary Iona Holsted says they'll make the call to open on a daily basis, getting advice from Civil Defence in the morning and informing schools by midday.

She says they'll give advice on infrastructure condition, power, sewage and flooding to take into account.

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