Further works will be undertaken on the A83 to establish how the local diversion route, the Old Military Road, can be improved to help keep Argyll accessible in the event of a landslip.
Transport Scotland will look at options to improve the general layout, access points and the operation and implementation of the diversion route should it be required.
The local diversion route is part of a range of measures being undertaken on the A83 under the Red Option scheme to help reduce the risk of impacts of landslides at the Rest and Be Thankful.
As well as the diversion route, the scheme has seen the introduction of additional fencing and debris netting as well as drainage and culvert improvements.
Scottish transport minister Derek Mackay said: “The A83 is a vital route for people in Argyll and Bute and the Scottish government is firmly committed to mitigating the effects of landslides in the area.
“At the recent A83 taskforce meeting, members agreed that improving the resilience of the Old Military Road would help maintain continuity of access in the long term and Transport Scotland will now take that work forward.
“Our mitigation measures are making a difference, with the netting and culverts successfully preventing debris from reaching the road.
“A total of £48M has been spent on the maintenance of the A83 since 2007. This includes more than £10M through the A83 taskforce with another £3M committed taskforce spend this financial year. This further underlines our determination to keep this key strategic route operational to support the local and regional communities and businesses.”