The work is being handled by Bear Scotland, which manages and maintains trunk roads in the north west of Scotland on behalf of Transport Scotland.
Euan Scott, Bear Scotland’s north west unit representative said: “These works are all essential improvements to ensure resilience of the A83 at the Rest and Be Thankful.
“We are pleased with the progress made so far and our crews will continue working with safety as our top priority. We thank the local community and road users for their patience while we carry out these essential works.”
The temporary traffic signals will be in place 24 hours a day, and access for emergency services and scheduled bus services will be maintained throughout the project.