Damage to the A46 at Salmon Springs prompted further inspections
Work has started on a £3m plan to strengthen a section of the A46 in Gloucestershire in an attempt to stop further landslips.
After the road was damaged in the summer floods of 2007 a survey found major work was needed on a 150m length of the road at Coopers Hill.
The first phase will improve drainage, repair safety barriers and fill in holes at the roadside.
This will be followed by work to stabilise the main landslip.
After the 2007 floods one of the first places to receive major work was at Salmon Springs, on the A46.
Part of the surface collapsed and the road was shut leading to lengthy diversions.
A Gloucestershire County Council spokesman said it recognised the need to investigate other sections of the A46 and other roads in the county which could be at risk of landslips.
"[The survey] has enabled us to establish where embankments are vulnerable and come up with solutions before we have to close a road as a result of a landslide, reducing disruption and delays for the travelling public."
The preparatory work will take four weeks to complete.
Cllr Stan Waddington added: "We have to undertake this drainage work now so that we are ready for the next stage which is stabilising the main landslip and retaining wall."