That inland road from Hanmer to Kaikoura is fine, like any country road it only takes a stock truck to mess up all the corners by throwing gravel all over it along with smelly green stuff. Been over that road heaps of times including when it was gravel.
Speed signs are indicative only, some signs in the South Island are very close to actual speeds ie going thru to Karamea great road but there is a corner which tightens up goes off camber then flicks back the other way just as you drift over the wrong side of the road.
The best roads are those with NO Recommended speed signs on them as this makes you read the road and not rely on the signs also stops you looking at your speedo all the time.
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