Canada

My experiences are mainly from near the northeastern corner of 11 in the 1990s (and yeah, I drove through some bad shit a few times). Evidence of anyone plowing into the banks or through them into the ditch along that stretch was pretty rare back then. Of course, that area may not be representative even for that time period.

I suspect that one of the things that's changed is training of transport truck drivers and enforcement of laws pertaining to transport trucks. Hell of a lot of those vehicles turn out to be overloaded or defective when they do run an enforcement blitz, and many of the drivers these days come from countries without significant snowfall and should be explicitly trained on how to handle our crappy weather before getting their licenses—but it isn't a requirement, so they aren't.

According to hearsay (as in, a friend with family in the area heard it from a local OPP officer) there's a section of 17 out near the Sault which is closed much more often than it should be these days because the firm subcontracted to keep it clear just isn't up to the work. Either that firm needs to be replaced by someone who can do the job, or that section of road needs to be improved even before we worry about three-laning anything. And I doubt it's the only spot with those kinds of problems.

Three-laning the highways won't help with weather-related issues, no. It may help with transport trucks trying to pass each other on inappropriate stretches of highway running people off the road, though, and similar. Widening 11 and 17 has been recommended in multiple government studies for decades.