The Transport Minister says speedsters will still be caught - even with signs warning them cameras are ahead.

More than 100 signs are being rolled out onto New Zealand roads over the coming year.

Minister Simeon Brown says it will give motorists a chance to slow before they enter high-crash areas.

But he says there will only be signs for fixed cameras.

"These signs are about providing forewarning - but at the same time, mobile cameras will continue to operate anywhere, at any time, and motorists are required to keep to the law."

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