The shingle defences are in addition to a 21-metre buffer strip of boulders, built last year year when the A379 was rebuilt inland.

The shingle - at the far ends of the buffer - will form a new natural defence for the road.

The movement of the shingle will be monitored and will help provide a long-term solution for the area.

The route is a vital link between Kingsbridge and Dartmouth and many local businesses said they suffered when the road was closed.

The £20,000 scheme - financed by local authorities - has been approved by the Slapton Line Partnership, which includes English Nature, the Department of Environment, Food and Rural Affairs (Defra) and the Whitley Wildlife Trust, which owns the land.