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© Angela ShawSnow plowing Bullock Road in St Arnaud on Saturday.
The New Zealand Transport Agency said extreme care was advised on South Island highways after a heavy dumping of snow overnight.

Spokesperson Lee Wright said police had assisted motorists on state highways and some had been taken to safety.

A considerable amount of snow had fallen on the Lewis Pass especially, and it would be some time before it dissipated.

"The Lewis Pass has 400mm of snow and a very heavy snow burden on the trees,"
Wright said.

"It is estimated that some of the 'snow bombs' are up to 3/4 tonne so no work can be done in these areas until they fall."

More bad weather is predicted today with forecasts showing snow down to 200 metres.

Police are warning motorists to use snow chains on most routes and many highways are down to 60km/h in many places.

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© Daniel SinclairSnow in Springs Junction on Friday afternoon