Worst case scenario seems correct-
The Missoulian reports that a subsidiary of the national oil company of Korea now wants to use scenic U.S. Highway 12 through north central Idaho and over Lolo Pass to transport numerous giant oil (tar sands) equipment to Alberta.
Despite worthless assurances about this kind of activity being a one time thing, it’s plainly obvious that as predicted the oil companies mean to make the highway along this asphalt ribbon through the wilderness an equipment hauling route.
This will slowly ruin the lives to downstream residents who have to endure these highway blockages, disrupt traffic into Montana, harm the Lochsa, and Middle Fork of the Clearwater River, and make recreational and timber cutting access into the surrounding mountains slow and difficult by requiring long alternative routes.
Third oil company looks to bring big rigs over U.S. Highway 12. By Kim Briggeman of the Missoulian.

The Lochsa River. North Central Idaho. Copyright Ralph Maughan
While Highway 12 through Idaho is just a 2-line highway, its improvement over the years (a gravel road until the 1960s) has long disrupted the lives of people. In the past it was Montana. A number of abandoned Eastern Montana towns came to their end as transport of their grain changed from the railroads to trucks going in the opposite direction down Highway 12.