The A30 is currently blocked in both directions and there's queueing traffic due to an accident near Cockwells Lane.
It's affecting traffic between Penzance and Hayle.
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The couple were driving from their wedding in Bristol to a hotel in Newquay when the snow hit.
Hundreds of schools have taken the decision not to open.
Heavy snow shut a 64-mile stretch of road between Exeter and Bodmin.