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i grew up in Oban and travelled to Fort William and Glasgow etc regularly - i know the roads pretty well.
I had at least 2 people i went to school with crash and die on those roads and countless more in my small town had injuries and totalled cars. People drive like fucking maniacs round there, and that's not even factoring in the tourists in their motorhomes (which btw is how I was knocked off last time I was riding up there) that swarm the place from June to August.
My point is that there are lots of ways to get around Scotland on nice, scenic and quiet roads... but in this part from Loch Lomond to Fort William, you really don't have many on-road options.
As others said - these roads can be really busy and they are definitely fast with poor sight lines. You couldn't pay me to ride them, especially during peak summer.
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!"