Pressure is being put on the Scottish Government to set a date for the opening of an alternative to the damage-prone A83.
Transport Secretary Michael Matheson has committed to finding a permanent solution for the Rest and Be Thankful, with an appraisal of 11 options to be carried out.
The move has been welcomed by the Argyll and Bute Council administration, but calls have been made for ministers to go further.
Aileen Morton, local authority leader, said: “Whilst we are relieved there is now a recognised case for investment and a commitment to move away from temporary mitigation measures, we still need construction timescales and a date for the new route to open.
“It is simply not enough to talk about the options and agree a consultation phase.
“For years, closure of the A83 has seriously impacted our communities.
“The early signs are encouraging but we must see swift progress maintained until the new route is fully operational.”
The route has been dogged by adverse weather events which have forced its closing for many years.
Work has been ongoing to repair the road since the latest incident on August 4, when a large landslide blocked it after heavy rain fall in the area.
Mr Matheson outlined plans to change the route to members of the community and local elected representatives at a meeting of the A83 taskforce on Thursday morning.
Potential options are being considered, while a team is being established to undertake more detailed assessments and stakeholder engagement.
It is hoped recommendations for a preferred route corridor will be published by 2021.
Mr Matheson said: “I understand the frustration and disruption that landslips at the A83 Rest and Be Thankful bring for local communities and drivers.
“While our previous investment in catch pits has helped keep the road open for an estimated 48 days when it would otherwise have closed, I realise people are looking for a long-term solution to dealing with landslips at the site.
“I have instructed officials at Transport Scotland to accelerate our work to consider alternative infrastructure options for the A83.
“Stakeholders will be involved in this process and we will publish recommendations for a preferred corridor in spring 2021.”