The £2 million upgrade project was carried out as part of the company's on-going truck maintenance programme following damage to the riverbank by a landslide.
300 metres of road was realigned away from the river gorge, with two bends removed to improve driving conditions.
Temporary traffic lights at the site have now be removed.
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The work represents further investment on the A82.
The £5m Crianlarich Bypass was open to traffic last year, works have been completed on the £9.2m Pulpit Rock scheme to remove the bottleneck and traffic lights at this location, and a £2m design commission is also progressing on the A82 between Tarbet and Inverarnan.
Transport Minister Derek Mackay said: "The Scottish Government has made a clear commitment to the northwest by implementing this important scheme which helps improve the transport infrastructure in the area.
"The removal of temporary traffic signals has restored journey time reliability and we have also taken the opportunity to improve driving conditions by widening the carriageway and taking away two of the bends through this section of the road."
(LM)
