The A15 north of Caenby Corner roundabout is partially blocked due to a collision involving a lorry.
Traffic is affected in both directions between the B1205 and Cliff Road near to Waddingham.
The accident happened just after 7am on the morning of Wednesday, January 3.
The white lorry left the carriageway into a field and overturned.
The road has been closed while the vehicle is recovered.
It is not yet clear if any other vehicles were involved or if anyone has been injured.
This is a developing story and will be updated accordingly.