The B1354 at Blickling, near Cromer, is blocked after a lorry overturned this afternoon (Tuesday).
It is not know if the accident is weather related.
A Norfolk police spokesman said officers were called just after 3.50pm and the lorry was on its side.
She added attempts were being made to recover the vehicle with a tractor and the driver was unhurt.
Motorists are being advised to take a diversion in that area.
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