Denbighshire County Council is advising motorists and residents in the south of the county about planned roadworks on the A542 at the Horseshoe Pass near Llangollen.
The road will be closed from Monday, 26th October for preparatory works, ahead of essential road surfacing works to take place.
The road is expected to be closed for three weeks, but will be open for traffic over the weekends whenever possible.
The area affected is between the quarry and the lay-by near the summit of the Horseshoe Pass.
Diversions are in place and will be signposted.
Councillor Brian Jones, Cabinet Lead Member for Waste, Transport and the Environment, said: “We have previously undertaken some works along the Pass to carry out some drainage works ahead of the main surfacing project.
“This work due to be carried out over the next few weeks is essential, as it will provide some quality improvement to the road surface.
"We will try and minimise the disruption and we would like to thank motorists in advance for their co-operation and understanding."