Cormac has started work to strengthen a retaining wall on the road between Maenporth Beach and Penrose Farm.
The work is expected to last around six weeks and a diversion for vehicles as well as HGVs and emergency vehicles will be provided.
The diversion route will go to Mawnan Smith via Hillhead Road and Penwarne Road onto Maenporth Road.
Maenporth Beach Café and the Cove Restaurant will be signed on the diversion route.
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