Ground investigations have started north of Glasgow to determine a route for an upgrade of the A82.
Environmental Scientifics Group’s Geotechnical Division is carrying out the two-month project on 16km of highway between Tarbet and Inverarnan.
The Scottish government hopes to design a preferred route for the road upgrade by next summer.
Transport minister Keith Brown said: “The 16km section of the A82 between Tarbet and Inverarnan runs between the iconic Loch Lomond and the stunning hills that border it, so it is important that any upgrade to the route fits with the challenges of the topography while maintaining the world renowned beauty of the area.
“Coupled with the construction work for the Pulpit Rock improvement scheme and the Crianlarich Bypass bringing improved road safety and journey time reliability, we are committed to upgrade the A82, which is a vital economic and social lifeline as it connects businesses and communities in the Highlands and Islands with the central belt.”