KEY POINTS:
A heavy frost means a day off school for some Southland children.
Several school bus runs have been cancelled around the Tuatapere/Western Southland area.
Classes have been called off at Huaroko Valley Primary School, and St Patrick's School at Nightcaps is also closed.
Police say drivers need to be fully aware of the icy conditions and adjust their driving accordingly.
They say shaded areas and bridges are particularly dangerous.
- NEWSTALK ZB