Police are advising motorists to reduce their speed and take extra care due to an area of reduced visibility on the A1 in Northumberland.
A quantity of garden refuse is alight at composting site, Com-vert, at Harecrag, next to the A1 near Shilbottle.
The fire is causing smoke to blow across the road and visibility has been greatly reduced in the immediate vicinity of the site.
Warning signs are in place to alert motorists and police are advising drivers to slow down and take extra care.
Police and the fire service are at the scene.
There are no toxic materials involved, and no one has been injured.
It is believed that the fire is likely to take some time to extinguish.