Roads crews working to reopen the A83 Rest and Be Thankful are said to be facing regular abuse from motorists.
A number of reports of threats being delivered by drivers have now been passed to police.
The A83 has been closed at Rest and Be Thankful since August 4, when 6,000 tonnes of mud and boulders the size of small cars swept down onto the carriageway.
The Old Military Road – which was also hit by landslips and temporarily closed – has been serving as a relief route to avoid a 60-mile detour.
But amidst repeated heavy rainfall, it has undergone a series of additional overnight closures as a safety precaution.
Bear Scotland is assessing the situation on a daily basis, with the scale and complexity of the works and severity of the weather ensuring it remains challenging.
Bear Scotland’s Eddie Ross said yesterday: “With more heavy rain forecast we have to close the Old Military Road from midnight tonight and will carry out a safety assessment around 9am on Saturday to consider if we can reopen.
“While we appreciate the frustration this can cause, safety has to come first and we need to make sure that we keep all road users safe at all times.
“We’ve had reports of our teams receiving verbal abuse and threats from some motorists at the road closure points on the A83.
“This abuse will not be tolerated and we are already working closely with police to investigate these incidences.
“Please respect our workforce who are only doing their job and working to keep all road users safe.