In October 2023 a retaining wall supporting the A470 between Talerddig and Dolfach partially collapsed and an emergency closure was put in place. During this period works were undertaken to stabilise the carriageway to allow the A470 to reopen with traffic lights in place to close the westbound lane. This arrangement has remained in place in order to remove any traffic loading from the weak edge.
This emergency repair and associated traffic management was a temporary solution put in place to keep traffic flowing on the A470 whilst a permanent solution was developed. Design work on the permanent repair has now been completed, and a road closure is now required in order to construct a new structure that will allow the road to fully reopen without traffic lights.