Based on what we are seeing under construction and just using logic, I would expect the stretch between the Sault and Winnipeg to be connected last as it serves little other purpose other than just completing the TCH. Connecting Calgary to Regina and Winnipeg serves some decent population centres as well as making better connections to the US. Connecting Sudbury to the Sault makes for much more convenient travel to and around the Great Lakes and opens up a lot of better connections to different parts of the US.I stopped by the proposed Terrace Bay SC location today and there's still no sign of construction.
Right now people in Alberta who want to go to the central or eastern parts of the continent need to drive west first. And people in Ontario and Quebec who want to go to the western part of the continent need to drive south first. Completing these two relatively small areas will make this style of road tripping much more reasonable.
While taking the TCH through Northwestern Ontario might be a fun drive, it is almost never the fastest route between any reasonable population centres. Even when driving a route like Kenora to Sault Ste. Marie, it is basically a wash in terms of time whether you try to drive through the US or drive through Ontario (in an ICE).
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