The £140,000 project involves clearing trees, drainage and removing loose rocks from the verge of the A82 route.
The works are part of a pledge by Transport Minister Derek Mackay last year to the A82 Partnership to improve the route in advance of its upgrade.
Transport Scotland are progressing with design work on plans to improve the road, with the preferred design option going on public display last year.
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Mr Mackay said: "This ten mile section of road through stunning hills and by the banks of the iconic Loch Lomond has presented a real challenge as we have taken forward the design work.
"Last October we were able to let the public see and comment on the preferred route option to upgrade the road between Tarbet and Inverarnan, and we are now taking forward the next phase of design which will lead to the preparation of draft Orders.
"This work will be getting underway next week and will include the clearing away of vegetation, overhanging trees and the removal of loose stones and rocks from the verge of the existing road as well as the clearance and improvement of the existing drainage system."
The work is expected to be completed by Easter.
(LM)
