It would be useful in delivering supplies to places like Ft. McMurray, Alberta. The could bypass Highway 63 altogether, which is the main highway from Edmonton.
Currently, when you get stuck behind a truck carrying some of the large equipment, you can find that this six hour trip becomes a 15 hour trip and there’s nothing you can do about it, if you value your life than your time.
It could also be useful in opening up the “Ring of Fire” in Northern Ontario. There are no roads there at all, so this would probably be more cost-effective than building new roads to get at the minerals.