I've always thought that twinning either 11 or 17 wouldn't be too bad a project to do. I mean, sure it would be expensive especially due to the length, but a lot of the heavy lifting was done when the right-of-ways for the first roads were already blasted and cleared decades ago. There would likely be some blasting and clearing required, but for much of the routes it looks like you already have a decent right-of-way for four lanes that's already there.
You could just cut some trees, lay down a widened road bed and put a median barrier (concrete or cable-stayed) down the middle.
As well, for much of the route you'd need very few interchanges and overpasses as there are no towns or cross roads.
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