Drivers have been warned of days of disruption on the A83 following a 500-tonne landslip at the Rest and Be Thankful in Argyll and Bute.
BEAR Scotland said the landslip was caused by rainfall overnight and that geotechnical engineers have now assessed the situation.
They said the landslip was successfully intercepted by debris fences and pits.
Traffic Scotland said the section of road was closed for around three hours on Sunday morning in both directions following the incident.
By 11am, a diversion was put in place via the Old Military Road for drivers under a convoy.
However motorists have been warned this will be in place until at least Tuesday morning and to expect delays of around 20 minutes to their journey.
Eddie Ross, BEAR Scotland project manager said: “The on-site traffic management team swiftly alerted of discoloured water and debris coming down a hillside channel at 7.30am this morning and the A83 was immediately closed as a safety precaution.
“The prompt mobilisation of the Old Military Road has minimised the use of the longer diversion route and ensured that Argyll and Bute remains open for business. Road users should expect delays of around 20 minutes whilst they are safely led through the short diversion route. We will review the situation over the course of the next few days to ensure it is safe to reopen the A83 fully, under traffic signal control.”
“The debris fences and pit have retained all of the debris from what was a considerable landslide event. They have protected road users and protected the road itself from damage and will greatly speed up the clear-up operation.”
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