? condition of highways from Montana thru Canada to Alaska?

The one thing I will add the the great posts above.
My cousin who lives south of Whitehorse, her husband drives up and down the roads of the Yukon every day for work.
All he asks is that travellers check/ look in the mirrors and when they see someone behind them, “ and if it is safe to do so” pull over enough so the person behind you can see on coming traffic.’
He also asks that travellers do NOT bunch up and leave at least 500 ft between vehicles.
His words not mine and he lives up there.’