Highways in Canada

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Also, the TCH completely misses Toronto, diverting off Hwy 400 at Hwy 12 and then heading east on Hwy 7 to Ottawa.

It's pretty clear that it's not suppose to be equivalent to an Interstate system. Our version of federalism makes it pretty clear that highway are provincial responsibilities and the configuration of our population in a strip along the southern border means that a national highway system is also kind of pointless too.