Work is due to start on Monday (December 10) to inspect and maintain the rock face on the westbound A5 to the east of Llangollen.
Being undertaken by contractors on behalf of The North & Mid Wales Trunk Road Agency, the work is due to be completed by next Friday (December 14).
A westbound lane closure on the A5 is required in order to carry out the works.
Temporary traffic lights will be in place during daylight hours in addition to a 10mph temporary speed restriction and convoy working. Traffic signals only will be in place overnight.
The duration of the work may increase following inspection of rock face.
Traffic Wales has apologised in advance for any inconvenience caused by the work.