Drivers are being told to expect delays on the A30 near Bodmin after a fuel spillage from a lorry closed the eastbound carriageway.
A clear up operation is underway but it is likely the road will remain closed until the end of today as it needs to be resurfaced.
The incident happened this morning (29 June) between the junctions with the A38 Bodmin South and the A395 Bodmin North, and queues are building in the area.
Highways England say that crews are working to clear up the scene. Traffic is being diverted via local roads. Drivers are being urged to plan extra time for their journeys.
There are currently delays of 30 minutes according to Highways England, with traffic building from Lanivet through Bodmin.
Updates to follow.