The Mexican border is statistically shorter in length, but has far more population and centers near it, and often runs through densely populated areas such as Tijuana or El Paso...and even when it IS in remoter desert areas, most of the year temperatures and conditions favor travel quite comfortably...
The most important fact is that, surely, Mexico must have 3 to 4 times the population of Canada...
You've got to be kidding. Our first snow was only a couple of weeks ago, and it's totally melted by the middle of march. Now that's JUST snow. Almost ANY road is passable with a 4X4...ANY time of year.
Frozen solid? Not even close.
Your ignorance astonishes me ... and to put it in writing, then post it ... astonishes me even more!