Signs will be installed warning drivers of hazardous conditions on a steep section of road between Prestatyn and Gwaenysgor on the border with Flintshire.
Denbighshire County Council will install three signs warning drivers of icy conditions.
Over the last five years there have been 45 accidents linked to wintery road conditions in the area and the signs will be deployed when conditions are hazardous and will instruct drivers to avoid the route.
Cllr Brian Jones, Denbighshire County Council lead member for Highways, Planning and Sustainable Travel, said:
“These signs, which will only be visible when conditions are hazardous, will warn drivers to use an alternative route.
“Conditions on this stretch of road can become very dangerous, even just with frost, and drivers should not use the road when the signs are in operation. Drivers who use the route when conditions are hazardous could be putting lives at risk.
“Due to the gradient of this stretch of road it is unsafe for Denbighshire County Council to deploy gritters to the area.”
The warning signs are due to be in place by the end of November.
The alternative route is Allt y Graig in Dyserth, a section of road which is gritted by Denbighshire County Council when conditions require.
Picture: Gwaenysgor viewpoint car park overlooking Prestatyn