Elsewhere on the same road, consultants have been appointed to start design work for the 16 km Tarbet to Inverarnan scheme.
Balfour Beatty, John Paul Construction, RJ McLeod, I&H Brown and Graham Construction are being invited to bid for the Crianlarich Bypass contract. Work is expected to start this summer and take a year to complete.
In addition, a £2m design contract for the Tarbet to Inverarnan scheme has been placed with Halcrow Fairhurst Joint Venture. This design work is expected to take two years.
Scotland’s transport minister, Keith Brown, said: “Connecting businesses and communities in the Highlands & Islands with the central belt is vital to the area’s future prosperity. That is why we are now taking forward our plans to build a bypass at Crianlarich with five companies invited to bid for this work. This investment will benefit local residents with less noise and congestion in the village, whilst road users can avoid the current delays experienced at the junction where the A82 meets the A85.
“We are also planning for the future upgrade of the 16km section between Tarbet and Inverarnan. The design and survey work, which is shortly to get underway, will help identify a preferred alignment for the future upgrade of the route which contains some of the most striking scenery in Scotland, framed by the rugged hillsides and western shore of Loch Lomond.
“The area presents many engineering challenges and the alignment will be designed to fit with the landscape and environment and help to maintain the renowned beauty of the National Park.
“The work we are doing along this vital route will lead to improved road safety and journey time reliability and meet the needs of business, communities and visitors alike.”