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It's a draft route. This looks quite nice:
wikipoodia does say it's a "major road in Scotland" but how busy is a major road in Scotland?
https://www.cyclingweekly.com/news/latest-news/road-safety-fears-long-distance-cycle-ride-133100
Though this is some tosser sooking about "overtaking opportunities". This ride is also 800 people rather than single riders so less risky due to numbers.
https://singletrackworld.com/forum/topic/a82-to-fort-william-cycle-friendly/ "hell no!"
the transalba is not inspiring at all - large chunks of poor routing and roads that I wouldn't attempt to ride on, ever - namely the a85 and a82. Pass.